diff --git a/voussoirkitjs/common.js b/voussoirkitjs/common.js
new file mode 100644
index 0000000..20b1c90
--- /dev/null
+++ b/voussoirkitjs/common.js
@@ -0,0 +1,575 @@
+const common = {};
+
+common.INPUT_TYPES = new Set(["INPUT", "TEXTAREA"]);
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// UTILS ///////////////////////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+common.create_message_bubble =
+function create_message_bubble(message_area, message_positivity, message_text, lifespan)
+{
+    if (lifespan === undefined)
+    {
+        lifespan = 8000;
+    }
+    const message = document.createElement("div");
+    message.className = "message_bubble " + message_positivity;
+    const span = document.createElement("span");
+    span.innerHTML = message_text;
+    message.appendChild(span);
+    message_area.appendChild(message);
+    setTimeout(function(){message_area.removeChild(message);}, lifespan);
+}
+
+common.is_narrow_mode =
+function is_narrow_mode()
+{
+    return getComputedStyle(document.documentElement).getPropertyValue("--narrow").trim() === "1";
+}
+
+common.is_wide_mode =
+function is_wide_mode()
+{
+    return getComputedStyle(document.documentElement).getPropertyValue("--wide").trim() === "1";
+}
+
+common.go_to_root =
+function go_to_root()
+{
+    window.location.href = "/";
+}
+
+common.refresh =
+function refresh()
+{
+    window.location.reload();
+}
+
+common.refresh_or_alert =
+function refresh_or_alert(response)
+{
+    if (response.meta.status !== 200)
+    {
+        alert(JSON.stringify(response));
+        return;
+    }
+    window.location.reload();
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// STRING TOOLS ////////////////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+common.join_and_trail =
+function join_and_trail(list, separator)
+{
+    if (list.length === 0)
+    {
+        return "";
+    }
+    return list.join(separator) + separator
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// HTML & DOM //////////////////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+common.delete_all_children =
+function delete_all_children(element)
+{
+    while (element.firstChild)
+    {
+        element.removeChild(element.firstChild);
+    }
+}
+
+common.html_to_element =
+function html_to_element(html)
+{
+    const template = document.createElement("template");
+    template.innerHTML = html.trim();
+    return template.content.firstElementChild;
+}
+
+common.size_iframe_to_content =
+function size_iframe_to_content(iframe)
+{
+    iframe.style.height = iframe.contentWindow.document.documentElement.scrollHeight + 'px';
+}
+
+common.update_dynamic_elements =
+function update_dynamic_elements(class_name, text)
+{
+    /*
+    Find all elements with this class and set their innertext to this text.
+    */
+    const elements = document.getElementsByClassName(class_name);
+    for (const element of elements)
+    {
+        element.innerText = text;
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// HOOKS & ADD-ONS /////////////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+common.bind_box_to_button =
+function bind_box_to_button(box, button, ctrl_enter)
+{
+    /*
+    Bind a textbox to a button so that pressing Enter within the textbox is the
+    same as clicking the button.
+
+    If `ctrl_enter` is true, then you must press ctrl+Enter to trigger the
+    button, which is important for textareas.
+
+    Thanks Yaroslav Yakovlev
+    http://stackoverflow.com/a/9343095
+    */
+    const bound_box_hook = function(event)
+    {
+        if (event.key !== "Enter")
+            {return;}
+
+        ctrl_success = !ctrl_enter || (event.ctrlKey);
+
+        if (! ctrl_success)
+            {return;}
+
+        button.click();
+    }
+    box.addEventListener("keyup", bound_box_hook);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// CSS-JS CLASSES //////////////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+common.init_atag_merge_params =
+function init_atag_merge_params(a)
+{
+    /*
+    To create an <a> tag where the ?parameters written on the href are merged
+    with the parameters of the current page URL, give it the class
+    "merge_params". If the URL and href contain the same parameter, the href
+    takes priority.
+
+    Optional:
+        data-merge-params: A whitelist of parameter names, separated by commas
+            or spaces. Only these parameters will be merged from the page URL.
+
+        data-merge-params-except: A blacklist of parameter names, separated by
+            commas or spaces. All parameters except these will be merged from
+            the page URL.
+
+    Example:
+        URL: ?filter=hello&orderby=score
+        href: "?orderby=date"
+        Result: "?filter=hello&orderby=date"
+    */
+    const page_params = Array.from(new URLSearchParams(window.location.search));
+    let to_merge;
+
+    if (a.dataset.mergeParams)
+    {
+        const keep = new Set(a.dataset.mergeParams.split(/[\s,]+/));
+        to_merge = page_params.filter(key_value => keep.has(key_value[0]));
+        delete a.dataset.mergeParams;
+    }
+    else if (a.dataset.mergeParamsExcept)
+    {
+        const remove = new Set(a.dataset.mergeParamsExcept.split(/[\s,]+/));
+        to_merge = page_params.filter(key_value => (! remove.has(key_value[0])));
+        delete a.dataset.mergeParamsExcept;
+    }
+    else
+    {
+        to_merge = page_params;
+    }
+
+    to_merge = to_merge.concat(Array.from(new URLSearchParams(a.search)));
+    const new_params = new URLSearchParams();
+    for (const [key, value] of to_merge)
+        { new_params.set(key, value); }
+    a.search = new_params.toString();
+    a.classList.remove("merge_params");
+}
+
+common.init_all_atag_merge_params =
+function init_all_atag_merge_params()
+{
+    const page_params = Array.from(new URLSearchParams(window.location.search));
+    const as = Array.from(document.getElementsByClassName("merge_params"));
+    for (const a of as)
+    {
+        setTimeout(() => common.init_atag_merge_params(a), 0);
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+common.init_button_with_confirm =
+function init_button_with_confirm(button)
+{
+    /*
+    To create a button that requires a second confirmation step, assign it the
+    class "button_with_confirm".
+
+    Required:
+        data-onclick: String that would normally be the button's onclick.
+            This is done so that if the button_with_confirm fails to initialize,
+            the button will be non-operational as opposed to being operational
+            but with no confirmation. For dangerous actions I think this is a
+            worthwhile move though it could lead to feature downtime.
+
+    Optional:
+        data-prompt: Text that appears next to the confirm button. Default is
+            "Are you sure?".
+
+        data-prompt-class: CSS class for the prompt span.
+
+        data-confirm: Text inside the confirm button. Default is to inherit the
+            original button's text.
+
+        data-confirm-class: CSS class for the confirm button. Default is to
+            inheret all classes of the original button, except for
+            "button_with_confirm" of course.
+
+        data-cancel: Text inside the cancel button. Default is "Cancel".
+
+        data-cancel-class: CSS class for the cancel button.
+
+        data-holder-class: CSS class for the new span that holds the menu.
+    */
+    button.classList.remove("button_with_confirm");
+
+    const holder = document.createElement("span");
+    holder.className = ("confirm_holder " + (button.dataset.holderClass || "")).trim();
+    delete button.dataset.holderClass;
+    if (button.dataset.holderId)
+    {
+        holder.id = button.dataset.holderId;
+        delete button.dataset.holderId;
+    }
+    button.parentElement.insertBefore(holder, button);
+
+    const holder_stage1 = document.createElement("span");
+    holder_stage1.className = "confirm_holder_stage1";
+    holder_stage1.appendChild(button);
+    holder.appendChild(holder_stage1);
+
+    const holder_stage2 = document.createElement("span");
+    holder_stage2.className = "confirm_holder_stage2 hidden";
+    holder.appendChild(holder_stage2);
+
+    let prompt;
+    let input_source;
+    if (button.dataset.isInput)
+    {
+        prompt = document.createElement("input");
+        prompt.placeholder = button.dataset.prompt || "";
+        input_source = prompt;
+    }
+    else
+    {
+        prompt = document.createElement("span");
+        prompt.innerText = (button.dataset.prompt || "Are you sure?") + " ";
+        input_source = undefined;
+    }
+    if (button.dataset.promptClass)
+    {
+        prompt.className = button.dataset.promptClass;
+    }
+    holder_stage2.appendChild(prompt)
+    delete button.dataset.prompt;
+    delete button.dataset.promptClass;
+
+    const button_confirm = document.createElement("button");
+    button_confirm.innerText = (button.dataset.confirm || button.innerText).trim();
+    if (button.dataset.confirmClass === undefined)
+    {
+        button_confirm.className = button.className;
+        button_confirm.classList.remove("button_with_confirm");
+    }
+    else
+    {
+        button_confirm.className = button.dataset.confirmClass;
+    }
+    button_confirm.input_source = input_source;
+    holder_stage2.appendChild(button_confirm);
+    holder_stage2.appendChild(document.createTextNode(" "));
+    if (button.dataset.isInput)
+    {
+        common.bind_box_to_button(prompt, button_confirm);
+    }
+    delete button.dataset.confirm;
+    delete button.dataset.confirmClass;
+    delete button.dataset.isInput;
+
+    const button_cancel = document.createElement("button");
+    button_cancel.innerText = button.dataset.cancel || "Cancel";
+    button_cancel.className = button.dataset.cancelClass || "";
+    holder_stage2.appendChild(button_cancel);
+    delete button.dataset.cancel;
+    delete button.dataset.cancelClass;
+
+    // If this is stupid, let me know.
+    const confirm_onclick = `
+        let holder = event.target.parentElement.parentElement;
+        holder.getElementsByClassName("confirm_holder_stage1")[0].classList.remove("hidden");
+        holder.getElementsByClassName("confirm_holder_stage2")[0].classList.add("hidden");
+    ` + button.dataset.onclick;
+    button_confirm.onclick = Function(confirm_onclick);
+
+    button.removeAttribute("onclick");
+    button.onclick = function(event)
+    {
+        const holder = event.target.parentElement.parentElement;
+        holder.getElementsByClassName("confirm_holder_stage1")[0].classList.add("hidden");
+        holder.getElementsByClassName("confirm_holder_stage2")[0].classList.remove("hidden");
+        const input = holder.getElementsByTagName("input")[0];
+        if (input)
+        {
+            input.focus();
+        }
+    }
+
+    button_cancel.onclick = function(event)
+    {
+        const holder = event.target.parentElement.parentElement;
+        holder.getElementsByClassName("confirm_holder_stage1")[0].classList.remove("hidden");
+        holder.getElementsByClassName("confirm_holder_stage2")[0].classList.add("hidden");
+    }
+    delete button.dataset.onclick;
+}
+
+common.init_all_button_with_confirm =
+function init_all_button_with_confirm()
+{
+    const buttons = Array.from(document.getElementsByClassName("button_with_confirm"));
+    for (const button of buttons)
+    {
+        setTimeout(() => common.init_button_with_confirm(button), 0);
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+common.init_all_input_bind_to_button =
+function init_all_input_bind_to_button()
+{
+    for (const input of document.querySelectorAll("*[data-bind-enter-to-button]"))
+    {
+        const button = document.getElementById(input.dataset.bindEnterToButton);
+        if (button)
+        {
+            common.bind_box_to_button(input, button, false);
+            delete input.dataset.bindEnterToButton;
+        }
+    }
+    for (const input of document.querySelectorAll("*[data-bind-ctrl-enter-to-button]"))
+    {
+        const button = document.getElementById(input.dataset.bindCtrlEnterToButton);
+        if (button)
+        {
+            common.bind_box_to_button(input, button, true);
+            delete input.dataset.bindCtrlEnterToButton;
+        }
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+common.init_enable_on_pageload =
+function init_enable_on_pageload(element)
+{
+    /*
+    To create an input element which is disabled at first, and is enabled when
+    the DOM has completed loading, give it the disabled attribute and the
+    class "enable_on_pageload".
+    */
+    element.disabled = false;
+    element.classList.remove("enable_on_pageload");
+}
+
+common.init_all_enable_on_pageload =
+function init_all_enable_on_pageload()
+{
+    const elements = Array.from(document.getElementsByClassName("enable_on_pageload"));
+    for (const element of elements)
+    {
+        setTimeout(() => common.init_enable_on_pageload(element), 0);
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+common.init_entry_with_history =
+function init_entry_with_history(input)
+{
+    input.addEventListener("keydown", common.entry_with_history_hook);
+    input.classList.remove("entry_with_history");
+}
+
+common.init_all_entry_with_history =
+function init_all_entry_with_history()
+{
+    const inputs = Array.from(document.getElementsByClassName("entry_with_history"));
+    for (const input of inputs)
+    {
+        setTimeout(() => common.init_entry_with_history(input), 0);
+    }
+}
+
+common.entry_with_history_hook =
+function entry_with_history_hook(event)
+{
+    const box = event.target;
+
+    if (box.entry_history === undefined)
+        {box.entry_history = [];}
+
+    if (box.entry_history_pos === undefined)
+        {box.entry_history_pos = null;}
+
+    if (event.key === "Enter")
+    {
+        if (box.value === "")
+            {return;}
+        box.entry_history.push(box.value);
+        box.entry_history_pos = null;
+    }
+    else if (event.key === "Escape")
+    {
+        box.entry_history_pos = null;
+        box.value = "";
+    }
+
+    if (box.entry_history.length == 0)
+        {return}
+
+    if (box.entry_history_pos !== null && box.value !== box.entry_history[box.entry_history_pos])
+        {return;}
+
+    if (event.key === "ArrowUp")
+    {
+        if (box.entry_history_pos === null)
+            {box.entry_history_pos = box.entry_history.length - 1;}
+        else if (box.entry_history_pos == 0)
+            {;}
+        else
+            {box.entry_history_pos -= 1;}
+
+        if (box.entry_history_pos === null)
+            {box.value = "";}
+        else
+            {box.value = box.entry_history[box.entry_history_pos];}
+
+        setTimeout(function(){box.selectionStart = box.value.length;}, 0);
+    }
+    else if (event.key === "ArrowDown")
+    {
+        if (box.entry_history_pos === null)
+            {;}
+        else if (box.entry_history_pos == box.entry_history.length-1)
+            {box.entry_history_pos = null;}
+        else
+            {box.entry_history_pos += 1;}
+
+        if (box.entry_history_pos === null)
+            {box.value = "";}
+        else
+            {box.value = box.entry_history[box.entry_history_pos];}
+
+        setTimeout(function(){box.selectionStart = box.value.length;}, 0);
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+common.init_tabbed_container =
+function init_tabbed_container(tabbed_container)
+{
+    const button_container = document.createElement("div");
+    button_container.className = "tab_buttons";
+    tabbed_container.prepend(button_container);
+    const tabs = Array.from(tabbed_container.getElementsByClassName("tab"));
+    for (const tab of tabs)
+    {
+        tab.classList.add("hidden");
+        const tab_id = tab.dataset.tabId || tab.dataset.tabTitle;
+        tab.dataset.tabId = tab_id;
+        tab.style.borderTopColor = "transparent";
+
+        const button = document.createElement("button");
+        button.className = "tab_button tab_button_inactive";
+        button.onclick = common.tabbed_container_switcher;
+        button.innerText = tab.dataset.tabTitle;
+        button.dataset.tabId = tab_id;
+        button_container.append(button);
+    }
+    tabs[0].classList.remove("hidden");
+    tabbed_container.dataset.activeTabId = tabs[0].dataset.tabId;
+    button_container.firstElementChild.classList.remove("tab_button_inactive");
+    button_container.firstElementChild.classList.add("tab_button_active");
+}
+
+common.init_all_tabbed_container =
+function init_all_tabbed_container()
+{
+    const tabbed_containers = Array.from(document.getElementsByClassName("tabbed_container"));
+    for (const tabbed_container of tabbed_containers)
+    {
+        setTimeout(() => common.init_tabbed_container(tabbed_container), 0);
+    }
+}
+
+common.tabbed_container_switcher =
+function tabbed_container_switcher(event)
+{
+    const tab_button = event.target;
+    if (tab_button.classList.contains("tab_button_active"))
+        { return; }
+
+    const tab_id = tab_button.dataset.tabId;
+    const tab_buttons = tab_button.parentElement.getElementsByClassName("tab_button");
+    for (const tab_button of tab_buttons)
+    {
+        if (tab_button.dataset.tabId === tab_id)
+        {
+            tab_button.classList.remove("tab_button_inactive");
+            tab_button.classList.add("tab_button_active");
+        }
+        else
+        {
+            tab_button.classList.remove("tab_button_active");
+            tab_button.classList.add("tab_button_inactive");
+        }
+    }
+    const tabbed_container = tab_button.closest(".tabbed_container");
+    tabbed_container.dataset.activeTabId = tab_id;
+    const tabs = tabbed_container.getElementsByClassName("tab");
+    for (const tab of tabs)
+    {
+        if (tab.dataset.tabId === tab_id)
+            { tab.classList.remove("hidden"); }
+        else
+            { tab.classList.add("hidden"); }
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+common.on_pageload =
+function on_pageload()
+{
+    common.init_all_atag_merge_params();
+    common.init_all_button_with_confirm();
+    common.init_all_enable_on_pageload();
+    common.init_all_entry_with_history();
+    common.init_all_input_bind_to_button();
+    common.init_all_tabbed_container();
+}
+document.addEventListener("DOMContentLoaded", common.on_pageload);
diff --git a/voussoirkitjs/contextmenus.js b/voussoirkitjs/contextmenus.js
new file mode 100644
index 0000000..6040a75
--- /dev/null
+++ b/voussoirkitjs/contextmenus.js
@@ -0,0 +1,48 @@
+const contextmenus = {};
+
+contextmenus.background_click =
+function background_click(event)
+{
+    const contextmenu = event.target.closest(".contextmenu");
+    if (! contextmenu)
+    {
+        contextmenus.hide_open_menus();
+        return true;
+    }
+}
+
+contextmenus.hide_open_menus =
+function hide_open_menus()
+{
+    const elements = document.getElementsByClassName("open_contextmenu");
+    while (elements.length > 0)
+    {
+        elements[0].classList.remove("open_contextmenu");
+    }
+}
+
+contextmenus.menu_is_open =
+function menu_is_open()
+{
+    return document.getElementsByClassName("open_contextmenu").length > 0;
+}
+
+contextmenus.show_menu =
+function show_menu(event, menu)
+{
+    contextmenus.hide_open_menus();
+    menu.classList.add("open_contextmenu");
+    const html = document.documentElement;
+    const over_right = Math.max(0, event.clientX + menu.offsetWidth - html.clientWidth);
+    const over_bottom = Math.max(0, event.clientY + menu.offsetHeight - html.clientHeight);
+    const left = event.clientX - over_right;
+    const top = event.pageY - over_bottom;
+    menu.style.left = left + "px";
+    menu.style.top = top + "px";
+}
+
+function on_pageload()
+{
+    document.body.addEventListener("click", contextmenus.background_click);
+}
+document.addEventListener("DOMContentLoaded", on_pageload);
diff --git a/voussoirkitjs/editor.js b/voussoirkitjs/editor.js
new file mode 100644
index 0000000..07cea3b
--- /dev/null
+++ b/voussoirkitjs/editor.js
@@ -0,0 +1,252 @@
+const editor = {};
+
+editor.PARAGRAPH_TYPES = new Set(["P", "PRE"]);
+
+editor.Editor =
+function Editor(element_argss, on_open, on_save, on_cancel)
+{
+    /*
+    This class wraps around display elements like spans, headers, and
+    paragraphs, and creates edit elements like inputs and textareas to edit
+    them with.
+
+    element_argss should be a list of dicts. Each dict is required to have "id"
+    which is unique amongst its peers, and "element" which is the display
+    element. Additionally, you may add the following properties to change the
+    element's behavior:
+
+    "autofocus": true
+        When the user opens the editor, this element will get .focus().
+        Only one element should have this.
+
+    "empty_text": string
+        If the display element contains this text, then the edit element will
+        be set to "" when opened.
+        If the edit element contains "", then the display element will
+        contain this text when saved.
+
+    "hide_when_empty": true
+        If the element does not have any text, it will get the "hidden" css
+        class after saving / closing.
+
+    "placeholder": string
+        The placeholder attribute of the edit element.
+
+    The editor object will contain a dict called elements that maps IDs to the
+    display element, edit elements, and your other options.
+
+    Your on_open, on_save and on_cancel hooks will be called with the editor
+    object as the only argument.
+
+    When your callbacks are used, the default `open`, `save`, `cancel`
+    methods are not called automatically. You should call them from within
+    your function. That's because you may wish to do some of your own
+    normalization before the default handler, and some of your own cleanup
+    after it. So it is up to you when to call the default.
+    */
+    this.cancel = function()
+    {
+        this.close();
+    };
+
+    this.close = function()
+    {
+        for (const element of Object.values(this.elements))
+        {
+            element.edit.classList.add("hidden");
+            if (! (element.display.innerText === "" && element.hide_when_empty))
+            {
+                element.display.classList.remove("hidden");
+            }
+        }
+        this.hide_spinner();
+        this.hide_error();
+        this.open_button.classList.remove("hidden");
+        this.save_button.classList.add("hidden");
+        this.cancel_button.classList.add("hidden");
+    };
+
+    this.hide_error = function()
+    {
+        this.error_message.classList.add("hidden");
+    };
+
+    this.hide_spinner = function()
+    {
+        this.spinner.hide();
+    };
+
+    this.open = function()
+    {
+        for (const element of Object.values(this.elements))
+        {
+            element.display.classList.add("hidden");
+            element.edit.classList.remove("hidden");
+
+            if (element.autofocus)
+            {
+                element.edit.focus();
+            }
+
+            if (element.empty_text !== undefined && element.display.innerText == element.empty_text)
+            {
+                element.edit.value = "";
+            }
+            else
+            {
+                element.edit.value = element.display.innerText;
+            }
+        }
+        this.open_button.classList.add("hidden");
+        this.save_button.classList.remove("hidden");
+        this.cancel_button.classList.remove("hidden");
+    };
+
+    this.save = function()
+    {
+        for (const element of Object.values(this.elements))
+        {
+            if (element.empty_text !== undefined && element.edit.value == "")
+            {
+                element.display.innerText = element.empty_text;
+            }
+            else
+            {
+                element.display.innerText = element.edit.value;
+            }
+        }
+
+        this.close();
+    };
+
+    this.show_error = function(message)
+    {
+        this.hide_spinner();
+        this.error_message.innerText = message;
+        this.error_message.classList.remove("hidden");
+    };
+
+    this.show_spinner = function(delay)
+    {
+        this.hide_error();
+        this.spinner.show(delay);
+    };
+
+    this.elements = {};
+
+    // End-user can put anything they want in here.
+    this.misc_data = {};
+
+    // Keep track of last edit element so we can put the toolbox after it.
+    let last_element;
+
+    for (const element_args of element_argss)
+    {
+        const element = {};
+        element.id = element_args.id;
+        this.elements[element.id] = element;
+
+        element.display = element_args.element;
+        element.empty_text = element_args.empty_text;
+        element.hide_when_empty = element_args.hide_when_empty;
+        element.autofocus = element_args.autofocus;
+
+        if (editor.PARAGRAPH_TYPES.has(element.display.tagName))
+        {
+            element.edit = document.createElement("textarea");
+            element.edit.rows = 6;
+        }
+        else
+        {
+            element.edit = document.createElement("input");
+            element.edit.type = "text";
+        }
+
+        element.edit.classList.add("editor_input");
+        element.edit.classList.add("hidden");
+
+        if (element_args.placeholder !== undefined)
+        {
+            element.edit.placeholder = element_args.placeholder;
+        }
+
+        element.display.parentElement.insertBefore(element.edit, element.display.nextSibling);
+        last_element = element.edit;
+    }
+
+    this.binder = function(func, fallback)
+    {
+        /*
+        Given a function that takes an Editor as its first argument,
+        return a new function which requires no arguments and calls the
+        function with this editor.
+
+        This is done so that the new function can be used in an event handler.
+        */
+        if (func == undefined)
+        {
+            return fallback.bind(this);
+        }
+
+        const bindable = () => func(this);
+        return bindable.bind(this);
+    }
+
+    // In order to prevent page jumping on load, you can add an element with
+    // class editor_toolbox_placeholder to the page and size it so it matches
+    // the buttons that are going to get placed there.
+    const placeholders = document.getElementsByClassName("editor_toolbox_placeholder");
+    for (const placeholder of placeholders)
+    {
+        placeholder.parentElement.removeChild(placeholder);
+    }
+
+    const toolbox = document.createElement("div");
+    toolbox.classList.add("editor_toolbox");
+    last_element.parentElement.insertBefore(toolbox, last_element.nextSibling);
+
+    this.open_button = document.createElement("button");
+    this.open_button.innerText = "Edit";
+    this.open_button.classList.add("editor_button");
+    this.open_button.classList.add("editor_open_button");
+    this.open_button.classList.add("green_button");
+    this.open_button.onclick = this.binder(on_open, this.open);
+    toolbox.appendChild(this.open_button);
+
+    this.save_button = document.createElement("button");
+    this.save_button.innerText = "Save";
+    this.save_button.classList.add("editor_button");
+    this.save_button.classList.add("editor_save_button");
+    this.save_button.classList.add("green_button");
+    this.save_button.classList.add("hidden");
+    this.save_button.onclick = this.binder(on_save, this.save);
+    toolbox.appendChild(this.save_button);
+    toolbox.appendChild(document.createTextNode(" "));
+
+    this.cancel_button = document.createElement("button");
+    this.cancel_button.innerText = "Cancel";
+    this.cancel_button.classList.add("editor_button");
+    this.cancel_button.classList.add("editor_cancel_button");
+    this.cancel_button.classList.add("gray_button");
+    this.cancel_button.classList.add("hidden");
+    this.cancel_button.onclick = this.binder(on_cancel, this.cancel);
+    toolbox.appendChild(this.cancel_button);
+
+    this.error_message = document.createElement("span");
+    this.error_message.classList.add("editor_error");
+    this.error_message.classList.add("hidden");
+    toolbox.appendChild(this.error_message);
+
+    spinner_element = document.createElement("span");
+    spinner_element.innerText = "Submitting...";
+    spinner_element.classList.add("editor_spinner");
+    spinner_element.classList.add("hidden");
+    this.spinner = new spinners.Spinner(spinner_element);
+    toolbox.appendChild(spinner_element);
+
+    for (const element of Object.values(this.elements))
+    {
+        const ctrl_enter = element.edit.tagName == "TEXTAREA";
+        common.bind_box_to_button(element.edit, this.save_button, ctrl_enter);
+    }
+}
diff --git a/voussoirkitjs/hotkeys.js b/voussoirkitjs/hotkeys.js
new file mode 100644
index 0000000..3882cdf
--- /dev/null
+++ b/voussoirkitjs/hotkeys.js
@@ -0,0 +1,110 @@
+const hotkeys = {};
+
+hotkeys.HOTKEYS = {};
+hotkeys.HELPS = [];
+
+hotkeys.hotkey_identifier =
+function hotkey_identifier(key, ctrlKey, shiftKey, altKey)
+{
+    // Return the string that will represent this hotkey in the dictionary.
+    return key.toLowerCase() + "." + (ctrlKey & 1) + "." + (shiftKey & 1) + "." + (altKey & 1);
+}
+
+hotkeys.hotkey_human =
+function hotkey_human(key, ctrlKey, shiftKey, altKey)
+{
+    // Return the string that will be displayed to the user to represent this hotkey.
+    let mods = [];
+    if (ctrlKey) { mods.push("CTRL"); }
+    if (shiftKey) { mods.push("SHIFT"); }
+    if (altKey) { mods.push("ALT"); }
+    mods = mods.join("+");
+    if (mods) { mods = mods + "+"; }
+    return mods + key.toUpperCase();
+}
+
+hotkeys.register_help =
+function register_help(help)
+{
+    hotkeys.HELPS.push(help);
+}
+
+hotkeys.register_hotkey =
+function register_hotkey(hotkey, action, description)
+{
+    if (! Array.isArray(hotkey))
+    {
+        hotkey = hotkey.split(/\s+/g);
+    }
+
+    const key = hotkey.pop();
+    modifiers = hotkey.map(word => word.toLocaleLowerCase());
+    const ctrlKey = modifiers.includes("control") || modifiers.includes("ctrl");
+    const shiftKey = modifiers.includes("shift");
+    const altKey = modifiers.includes("alt");
+
+    const identifier = hotkeys.hotkey_identifier(key, ctrlKey, shiftKey, altKey);
+    const human = hotkeys.hotkey_human(key, ctrlKey, shiftKey, altKey);
+    hotkeys.HOTKEYS[identifier] = {"action": action, "human": human, "description": description}
+}
+
+hotkeys.should_prevent_hotkey =
+function should_prevent_hotkey(event)
+{
+    /*
+    If the user is currently in an input element, then the registered hotkey
+    will be ignored and the browser will use its default behavior.
+    */
+    if (event.target.tagName == "INPUT" && event.target.type == "checkbox")
+    {
+        return false;
+    }
+    else
+    {
+        return common.INPUT_TYPES.has(event.target.tagName);
+    }
+}
+
+hotkeys.show_all_hotkeys =
+function show_all_hotkeys()
+{
+    // Display an Alert with a list of all the hotkeys.
+    let lines = [];
+    for (const identifier in hotkeys.HOTKEYS)
+    {
+        const line = hotkeys.HOTKEYS[identifier]["human"] + " :  " + hotkeys.HOTKEYS[identifier]["description"];
+        lines.push(line);
+    }
+    if (hotkeys.HELPS)
+    {
+        lines.push("");
+    }
+    for (const help of hotkeys.HELPS)
+    {
+        lines.push(help);
+    }
+    lines = lines.join("\n");
+    alert(lines);
+}
+
+hotkeys.hotkeys_listener =
+function hotkeys_listener(event)
+{
+    // console.log(event.key);
+    if (hotkeys.should_prevent_hotkey(event))
+    {
+        return;
+    }
+
+    identifier = hotkeys.hotkey_identifier(event.key, event.ctrlKey, event.shiftKey, event.altKey);
+    //console.log(identifier);
+    if (identifier in hotkeys.HOTKEYS)
+    {
+        hotkeys.HOTKEYS[identifier]["action"](event);
+        event.preventDefault();
+    }
+}
+
+window.addEventListener("keydown", hotkeys.hotkeys_listener);
+
+hotkeys.register_hotkey("/", hotkeys.show_all_hotkeys, "Show hotkeys.");
diff --git a/voussoirkitjs/http.js b/voussoirkitjs/http.js
new file mode 100644
index 0000000..0b057a3
--- /dev/null
+++ b/voussoirkitjs/http.js
@@ -0,0 +1,228 @@
+const http = {};
+
+http.HEADERS = {};
+
+http.requests_in_flight = 0;
+
+http.request_queue = {};
+http.request_queue.array = [];
+
+http.request_queue.push =
+function request_queue_push(func, kwargs)
+{
+    const delay = ((! kwargs) ? 0 : kwargs["delay"]) || 0;
+    http.request_queue.array.push(func)
+    setTimeout(http.request_queue.next, 0);
+}
+
+http.request_queue.pushleft =
+function request_queue_pushleft(func, kwargs)
+{
+    http.request_queue.array.unshift(func)
+    setTimeout(http.request_queue.next, 0);
+}
+
+http.request_queue.clear =
+function request_queue_clear()
+{
+    while (http.request_queue.array.length > 0)
+    {
+        http.request_queue.array.shift();
+    }
+}
+
+http.request_queue.next =
+function request_queue_next()
+{
+    if (http.requests_in_flight > 0)
+    {
+        return;
+    }
+    if (http.request_queue.array.length === 0)
+    {
+        return;
+    }
+    const func = http.request_queue.array.shift();
+    func();
+}
+
+http.formdata =
+function formdata(data)
+{
+    const fd = new FormData();
+    for (let [key, value] of Object.entries(data))
+    {
+        if (value === undefined)
+        {
+            continue;
+        }
+        if (value === null)
+        {
+            value = '';
+        }
+        fd.append(key, value);
+    }
+    return fd;
+}
+
+http._request =
+function _request(kwargs)
+{
+    /*
+    Perform an HTTP request and call the `callback` with the response.
+
+    Required kwargs:
+    url
+
+    Optional kwargs:
+    with_credentials: goes to xhr.withCredentials
+    callback
+    asynchronous: goes to the async parameter of xhr.open
+    headers: an object fully of {key: value} that will get added as headers in
+        addition to those in the global http.HEADERS.
+    data: the body of your post request. Can be a FormData object, a string,
+        or an object of {key: value} that will get automatically turned into
+        a FormData.
+
+    The response will have the following structure:
+    {
+        "meta": {
+            "id": a large random number to uniquely identify this request.
+            "request": the XMLHttpRequest object,
+            "completed": true / false,
+            "status": If the connection failed or request otherwise could not
+                complete, `status` will be 0. If the request completed,
+                `status` will be the HTTP response code.
+            "json_ok": If the server responded with parseable json, `json_ok`
+                will be true, and that data will be in `response.data`. If the
+                server response was not parseable json, `json_ok` will be false
+                and `response.data` will be undefined.
+            "kwargs": The kwargs exactly as given to this call.
+        }
+        "data": {JSON parsed from server response if json_ok},
+        "retry": function you can call to retry the request.
+    }
+
+    So, from most lenient to most strict, error catching might look like:
+    if response.meta.completed
+    if response.meta.json_ok
+    if response.meta.status === 200
+    if response.meta.status === 200 and response.meta.json_ok
+    */
+    const request = new XMLHttpRequest();
+    const response = {
+        "meta": {
+            "id": Math.random() * Number.MAX_SAFE_INTEGER,
+            "request": request,
+            "completed": false,
+            "status": 0,
+            "json_ok": false,
+            "kwargs": kwargs,
+        },
+        "retry": function(){http._request(kwargs)},
+    };
+
+    request.onreadystatechange = function()
+    {
+        /*
+        readystate values:
+        0 UNSENT / ABORTED
+        1 OPENED
+        2 HEADERS_RECEIVED
+        3 LOADING
+        4 DONE
+        */
+        if (request.readyState != 4)
+        {
+            return;
+        }
+
+        http.requests_in_flight -= 1;
+        setTimeout(http.request_queue_next, 0);
+
+        if (! (kwargs["callback"]))
+        {
+            return;
+        }
+
+        response.meta.status = request.status;
+
+        if (request.status != 0)
+        {
+            response.meta.completed = true;
+            try
+            {
+                response.data = JSON.parse(request.responseText);
+                response.meta.json_ok = true;
+            }
+            catch (exc)
+            {
+                response.meta.json_ok = false;
+            }
+        }
+        kwargs["callback"](response);
+    };
+
+    // Headers
+
+    const asynchronous = "asynchronous" in kwargs ? kwargs["asynchronous"] : true;
+    request.open(kwargs["method"], kwargs["url"], asynchronous);
+
+    for (const [header, value] of Object.entries(http.HEADERS))
+    {
+        request.setRequestHeader(header, value);
+    }
+
+    const more_headers = kwargs["headers"] || {};
+    for (const [header, value] of Object.entries(more_headers))
+    {
+        request.setRequestHeader(header, value);
+    }
+
+    if (kwargs["with_credentials"])
+    {
+        request.withCredentials = true;
+    }
+
+    // Send
+
+    let data = kwargs["data"];
+    if (data === undefined || data === null)
+    {
+        request.send();
+    }
+    else if (data instanceof FormData)
+    {
+        request.send(data);
+    }
+    else if (typeof(data) === "string" || data instanceof String)
+    {
+        request.send(data);
+    }
+    else
+    {
+        request.send(http.formdata(data));
+    }
+    http.requests_in_flight += 1;
+
+    return request;
+}
+
+http.get =
+function get(kwargs)
+{
+    kwargs["method"] = "GET";
+    return http._request(kwargs);
+}
+
+http.post =
+function post(kwargs)
+{
+    /*
+    `data`:
+        a FormData object which you have already filled with values, or a
+        dictionary from which a FormData will be made, using http.formdata.
+    */
+    kwargs["method"] = "POST";
+    return http._request(kwargs);
+}
diff --git a/voussoirkitjs/spinners.js b/voussoirkitjs/spinners.js
new file mode 100644
index 0000000..b79780b
--- /dev/null
+++ b/voussoirkitjs/spinners.js
@@ -0,0 +1,201 @@
+const spinners = {};
+
+/*
+In general, spinners are used for functions that launch a callback, and the
+callback will close the spinner after it runs. But, if your initial function
+decides not to launch the callback (insufficient parameters, failed clientside
+checks, etc.), you can have it return spinners.BAIL and the spinners will close
+immediately. Of course, you're always welcome to use
+spinners.close_button_spinner(button), but this return value means you don't
+need to pull the button into a variable, as long as you weren't using the
+return value anyway.
+*/
+spinners.BAIL = "spinners.BAIL";
+
+spinners.Spinner =
+function Spinner(element)
+{
+    this.show = function(delay)
+    {
+        clearTimeout(this.delayed_showing_timeout);
+
+        if (delay)
+        {
+            this.delayed_showing_timeout = setTimeout(function(thisthis){thisthis.show()}, delay, this);
+        }
+        else
+        {
+            this.delayed_showing_timeout = null;
+            this.element.classList.remove("hidden");
+        }
+    }
+
+    this.hide = function()
+    {
+        clearTimeout(this.delayed_showing_timeout);
+        this.delayed_showing_timeout = null;
+
+        this.element.classList.add("hidden");
+    }
+
+    this.delayed_showing_timeout = null;
+    this.element = element;
+}
+
+spinners.spinner_button_index = 0;
+spinners.button_spinner_groups = {};
+/*
+When a group member is closing, it will call the closer on all other members
+in the group. Of course, this would recurse forever without some kind of
+flagging, so this dict will hold group_id:true if a close is in progress,
+and be empty otherwise.
+*/
+spinners.spinner_group_closing = {};
+
+spinners.add_to_spinner_group =
+function add_to_spinner_group(group_id, button)
+{
+    if (!(group_id in spinners.button_spinner_groups))
+    {
+        spinners.button_spinner_groups[group_id] = [];
+    }
+    spinners.button_spinner_groups[group_id].push(button);
+}
+
+spinners.close_button_spinner =
+function close_button_spinner(button)
+{
+    window[button.dataset.spinnerCloser]();
+}
+
+spinners.close_grouped_spinners =
+function close_grouped_spinners(group_id)
+{
+    if (group_id && !(spinners.spinner_group_closing[group_id]))
+    {
+        spinners.spinner_group_closing[group_id] = true;
+        for (const button of spinners.button_spinner_groups[group_id])
+        {
+            window[button.dataset.spinnerCloser]();
+        }
+        delete spinners.spinner_group_closing[group_id];
+    }
+}
+
+spinners.open_grouped_spinners =
+function open_grouped_spinners(group_id)
+{
+    for (const button of spinners.button_spinner_groups[group_id])
+    {
+        window[button.dataset.spinnerOpener]();
+    }
+}
+
+spinners.init_button_with_spinner =
+function init_button_with_spinner()
+{
+    /*
+    To create a button that has a spinner, and cannot be clicked again while
+    the action is running, assign it the class "button_with_spinner".
+    When you're ready for the spinner to disappear, call
+    spinners.close_button_spinner(button).
+
+    Optional:
+        data-spinner-id: If you want to use your own element as the spinner,
+            give its ID here. Otherwise a new one will be created.
+
+        data-spinner-delay: The number of milliseconds to wait before the
+            spinner appears. For tasks that you expect to run very quickly,
+            this helps prevent a pointlessly short spinner. Note that the button
+            always becomes disabled immediately, and this delay only affects
+            the separate spinner element.
+
+        data-holder-class: CSS class for the new span that holds the menu.
+
+        data-spinner-group: An opaque string. All button_with_spinner that have
+            the same group will go into spinner mode when any of them is
+            clicked. Useful if you want to have two copies of a button on the
+            page, or two buttons which do opposite things and you only want one
+            to run at a time.
+    */
+    const buttons = Array.from(document.getElementsByClassName("button_with_spinner"));
+    for (const button of buttons)
+    {
+        button.classList.remove("button_with_spinner");
+        button.innerHTML = button.innerHTML.trim();
+
+        const holder = document.createElement("span");
+        holder.classList.add("spinner_holder");
+        holder.classList.add(button.dataset.holderClass || "spinner_holder");
+        button.parentElement.insertBefore(holder, button);
+        holder.appendChild(button);
+
+        if (button.dataset.spinnerGroup)
+        {
+            spinners.add_to_spinner_group(button.dataset.spinnerGroup, button);
+        }
+
+        let spinner_element;
+        if (button.dataset.spinnerId)
+        {
+            spinner_element = document.getElementById(button.dataset.spinnerId);
+            spinner_element.classList.add("hidden");
+        }
+        else
+        {
+            spinner_element = document.createElement("span");
+            spinner_element.innerText = button.dataset.spinnerText || "Working...";
+            spinner_element.classList.add("hidden");
+            holder.appendChild(spinner_element);
+        }
+
+        const spin = new spinners.Spinner(spinner_element);
+        const spin_delay = parseFloat(button.dataset.spinnerDelay) || 0;
+
+        button.dataset.spinnerOpener = "spinner_opener_" + spinners.spinner_button_index;
+        window[button.dataset.spinnerOpener] = function spinner_opener()
+        {
+            spin.show(spin_delay);
+            button.disabled = true;
+        }
+        // It is expected that the function referenced by onclick will call
+        // spinners.close_button_spinner(button) when appropriate, since from
+        // our perspective we cannot be sure when to close the spinner.
+        button.dataset.spinnerCloser = "spinner_closer_" + spinners.spinner_button_index;
+        window[button.dataset.spinnerCloser] = function spinner_closer()
+        {
+            spinners.close_grouped_spinners(button.dataset.spinnerGroup);
+            spin.hide();
+            button.disabled = false;
+        }
+
+        const wrapped_onclick = button.onclick;
+        button.removeAttribute('onclick');
+        button.onclick = function(event)
+        {
+            if (button.dataset.spinnerGroup)
+            {
+                spinners.open_grouped_spinners(button.dataset.spinnerGroup);
+            }
+            else
+            {
+                window[button.dataset.spinnerOpener]();
+            }
+            const ret = wrapped_onclick(event);
+            if (ret === spinners.BAIL)
+            {
+                window[button.dataset.spinnerCloser]();
+            }
+            return ret;
+        }
+
+        spinners.spinner_button_index += 1;
+    }
+}
+
+spinners.on_pageload =
+function on_pageload()
+{
+    spinners.init_button_with_spinner();
+}
+document.addEventListener("DOMContentLoaded", spinners.on_pageload);