/usr/share/geary/theming/message-viewer.html is in geary 0.6.0-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59  | <html>
<head><title>Geary</title></head>
<body>
<div id="message_container"><span id="placeholder"></span></div>
<div id="multiple_messages"><div id="selection_counter" class="email"></div></div>
<div id="email_template" class="email">
    <div class="compressed_note"><span><span></div>
    <div class="geary_spacer"></div>
    <div class="email_container">
        <div class="email_warning"></div>
        <div class="header_container">
            <img src="" class="avatar" />
            <div class="button_bar">
                <div class="starred button"><img src="" class="icon" /></div>
                <div class="unstarred button"><img src="" class="icon" /></div>
                <div class="menu button"><img src="" class="icon" /></div>
            </div>
            <img src="" class="attachment icon" />
            <div class="header"></div>
            <div class="preview"></div>
        </div>
        <div class="remote_images"><img class="close_show_images button" /></div>
        <div class="body"></div>
        <div class="draft_edit"><span class="draft_edit_button button"></span></div>
    </div>
</div>
<div id="attachment_template" class="attachment_container">
    <div class="top_border"></div>
    <table class="attachment"><tr>
        <td class="preview"><img src="" /></td>
        <td class="info">
            <div class="filename"></div>
            <div class="filesize"></div>
        </td>
    </tr></table>
</div>
<div id="link_warning_template" class="link_warning">
    <img class="close_link_warning button" />
</div>
<div id="spinner">
<!--
 Spinner code from CSSLoad.net
 License: http://cssload.net/en/terms_of_use
 -->
<div id="floatingCirclesG">
    <div class="f_circleG" id="frotateG_01"></div>
    <div class="f_circleG" id="frotateG_02"></div>
    <div class="f_circleG" id="frotateG_03"></div>
    <div class="f_circleG" id="frotateG_04"></div>
    <div class="f_circleG" id="frotateG_05"></div>
    <div class="f_circleG" id="frotateG_06"></div>
    <div class="f_circleG" id="frotateG_07"></div>
    <div class="f_circleG" id="frotateG_08"></div>
</div>
</div>
</body>
</html>
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