diff -r 000000000000 -r 6474c204b198 browser/devtools/markupview/markup-view.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/markupview/markup-view.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,167 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+:root {
+  -moz-control-character-visibility: visible;
+}
+
+/* Force height and width (possibly overflowing) from inline elements.
+ * This allows long overflows of text or input fields to still be styled with
+ * the container, rather than the background disappearing when scrolling */
+#root {
+  float: left;
+  min-width: 100%;
+}
+
+#root-wrapper:after {
+   content: "";
+   display: block;
+   clear: both;
+   position:relative;
+}
+
+.html-editor {
+  display: none;
+  position: absolute;
+  z-index: 2;
+
+  /* Use the same margin/padding trick used by .child tags to ensure that
+   * the editor covers up any content to the left (including expander arrows
+   * and hover effects). */
+  margin-left: -1000em;
+  padding-left: 1000em;
+}
+
+.html-editor-inner {
+  border: solid .1px;
+  flex: 1 1 auto;
+}
+
+.html-editor iframe {
+  height: 100%;
+  width: 100%;
+  border: none;
+  margin: 0;
+  padding: 0;
+}
+
+.children {
+  list-style: none;
+  padding: 0;
+  margin: 0;
+}
+
+/* Tags are organized in a UL/LI tree and indented thanks to a left padding.
+ * A very large padding is used in combination with a slightly smaller margin
+ * to make sure childs actually span from edge-to-edge. */
+.child {
+  margin-left: -1000em;
+  padding-left: 1001em;
+}
+
+.tag-line {
+  min-height: 1.4em;
+  line-height: 1.4em;
+  position: relative;
+}
+
+.html-editor-container {
+  position: relative;
+  min-height: 200px;
+}
+
+/* This extra element placed in each tag is positioned absolutely to cover the
+ * whole tag line and is used for background styling (when a selection is made
+ * or when the tag is flashing) */
+.tag-line .tag-state {
+  position: absolute;
+  left: -1000em;
+  right: 0;
+  height: 100%;
+  z-index: -1;
+}
+
+.expander {
+  display: inline-block;
+  margin-left: -14px;
+  vertical-align: middle;
+}
+
+.child.collapsed .child {
+  display: none;
+}
+
+.child > .tag-line:first-child .close {
+  display: none;
+}
+
+.child.collapsed > .tag-line:first-child .close {
+  display: inline;
+}
+
+.child.collapsed > .tag-line ~ .tag-line {
+  display: none;
+}
+
+.child.collapsed .close {
+  display: inline;
+}
+
+.closing-bracket {
+  pointer-events: none;
+}
+
+.newattr {
+  display: inline-block;
+  width: 1em;
+  height: 1ex;
+  margin-right: -1em;
+  padding: 1px 0;
+}
+
+.newattr:focus {
+  margin-right: 0;
+}
+
+.tag-state.flash-out {
+  transition: background .5s;
+}
+
+/* Preview */
+
+#previewbar {
+  position: fixed;
+  top: 0;
+  right: 0;
+  width: 90px;
+  background: black;
+  border-left: 1px solid #333;
+  border-bottom: 1px solid #333;
+  overflow: hidden;
+}
+
+#preview {
+  position: absolute;
+  top: 0;
+  right: 5px;
+  width: 80px;
+  height: 100%;
+  background-image: -moz-element(#root);
+  background-repeat: no-repeat;
+}
+
+#previewbar.hide,
+#previewbar.disabled {
+  display: none;
+}
+
+#viewbox {
+  position: absolute;
+  top: 0;
+  right: 5px;
+  width: 80px;
+  border: 1px dashed #888;
+  background: rgba(205,205,255,0.2);
+  outline: 1px solid transparent;
+}