GMail - HTML - Mark Page As Read

GMail - MAAR.js

// ==UserScript==
// @name        GMail - Mark Page As Read
// @namespace   gmail
// @include     https://mail.google.com/*
// @version     1
// @grant       none
// ==/UserScript==
(function() {
    'use strict';

    // Add From Box
    if(document.getElementById("cc") != null)
    {
        var cc_tr = document.getElementById("cc").parentNode.parentNode;

        var from_row = document.createElement("tr");
        var label_td = document.createElement("td");
        label_td.innerHTML = "<b>From:</b>";
        label_td.align = "right";
        from_row.appendChild(label_td);
        var to_box_td = document.createElement("td");
        to_box_td.innerHTML = '<input name="from" id="from" value="" size="40" class="i" autocomplete="off" type="text">';
        from_row.appendChild(to_box_td);

        cc_tr.parentNode.insertBefore(from_row, cc_tr);
    }

    var leftmost_button = document.getElementsByName('nvp_a_arch')[0] || document.getElementsByName('nvp_bu_rl')[0] || document.getElementsByName('nvp_a_dl')[0] || document.getElementsByName('nvp_a_sp')[0];
    if(leftmost_button) {
        var maar_btn = document.createElement('button');
        maar_btn.name = 'x-re-mark-all-as-read';
        maar_btn.innerHTML = 'M-A-A-R';
        maar_btn.onclick = function () {
            // drop down:
            document.getElementsByName('tact')[0].value = 'rd';
            //all checkboxes:
            var boxes = document.getElementsByName('t');
            for (var x = 0; x < boxes.length; ++x) {
                boxes[x].checked = true;
            }
            document.getElementsByName('nvp_tbu_go')[0].click();
        };

        var maa = document.createElement("input");
        maa.type = "checkbox";
        maa.name = "x-re-mark-all";
        maa.onclick = function() {
            var boxes = document.getElementsByName('t');
            for (var x = 0; x < boxes.length; ++x) {
                boxes[x].checked = maa.checked;
            }
        };

        var selectAllunread = document.createElement('button');
        selectAllunread.name = 'x-re-select-add-unread';
        selectAllunread.innerHTML = 'S-A-U';
        selectAllunread.onclick = function () {
            var boxes = document.getElementsByName('t');
            for (var x = 0; x< boxes.length ; ++x) {
                if(boxes[x].parentNode.parentNode.bgColor == '#ffffff')
                    boxes[x].checked = true;
            }
            return false;
        };

        leftmost_button.parentNode.insertBefore(maar_btn, leftmost_button);
        leftmost_button.parentNode.insertBefore(selectAllunread, maar_btn);
        leftmost_button.parentNode.insertBefore(maa, selectAllunread);
    }

})();

There are a few features missing from the incredibly fast HTML view of GMail; this crowbars some stuff into the DOM to do some of the functions I miss (select all is the big one!)