Source/core/xml/DocumentXMLTreeViewer.css

/* Copyright 2014 The Chromium Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

div.header {
    border-bottom: 2px solid black;
    padding-bottom: 5px;
    margin: 10px;
}

div.collapsible > div.hidden {
    display:none;
}

.pretty-print {
    margin-top: 1em;
    margin-left: 20px;
    font-family: monospace;
    font-size: 13px;
}

#webkit-xml-viewer-source-xml {
    display: none;
}

.collapsible-content {
    margin-left: 1em;
}
.comment {
    white-space: pre;
}

.button {
    -webkit-user-select: none;
    cursor: pointer;
    display: inline-block;
    margin-left: -10px;
    width: 10px;
    background-repeat: no-repeat;
    background-position: left top;
    vertical-align: bottom;
}

.collapse-button {
    background-image: -webkit-canvas(arrowDown);
    height: 10px;
}

.expand-button {
    background-image: -webkit-canvas(arrowRight);
    height: 11px;
}