Add a user agent stylesheet for extension options pages

extensions/renderer/resources/extension.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.
  *
- * A style sheet for Chrome extensions.
- */
+ * This stylesheet is used to apply Chrome styles to extension pages that opt in
+ * to using them. These styles have been copied from
+ * ui/webui/resources/css/chrome_shared.css and
+ * ui/webui/resources/css/widgets.css. This is to prevent WebUI changes from
+ * breaking extensions, however please keep the files in sync if possible.
+ */
+
+/* Prevent CSS from overriding the hidden property. */
+[hidden] {
+  display: none !important;
+}
+
+html.loading * {
+  -webkit-transition-delay: 0 !important;
+  -webkit-transition-duration: 0 !important;
+}
 
 body {
-  font-family: $FONTFAMILY;
-  font-size: $FONTSIZE;
-}
+  cursor: default;
+  margin: 0;
+}
+
+p {
+  line-height: 1.8em;
+}
+
+h1,
+h2,
+h3 {
+  -webkit-user-select: none;
+  font-weight: normal;
+  /* Makes the vertical size of the text the same for all fonts. */
+  line-height: 1;
+}
+
+h1 {
+  font-size: 1.5em;
+}
+
+h2 {
+  font-size: 1.3em;
+  margin-bottom: 0.4em;
+}
+
+h3 {
+  color: black;
+  font-size: 1.2em;
+  margin-bottom: 0.8em;
+}
+
+a {
+  color: rgb(17, 85, 204);
+  text-decoration: underline;
+}
+
+a:active {
+  color: rgb(5, 37, 119);
+}
+
+/* Elements that need to be LTR even in an RTL context, but should align
+ * right. (Namely, URLs, search engine names, etc.)
+ */
+html[dir='rtl'] .weakrtl {
+  direction: ltr;
+  text-align: right;
+}
+
+/* Input fields in search engine table need to be weak-rtl. Since those input
+ * fields are generated for all cr.ListItem elements (and we only want weakrtl
+ * on some), the class needs to be on the enclosing div.
+ */
+html[dir='rtl'] div.weakrtl input {
+  direction: ltr;
+  text-align: right;
+}
+
+html[dir='rtl'] .favicon-cell.weakrtl {
+  -webkit-padding-end: 22px;
+  -webkit-padding-start: 0;
+}
+
+/* weakrtl for selection drop downs needs to account for the fact that
+ * Webkit does not honor the text-align attribute for the select element.
+ * (See Webkit bug #40216)
+ */
+html[dir='rtl'] select.weakrtl {
+  direction: rtl;
+}
+
+html[dir='rtl'] select.weakrtl option {
+  direction: ltr;
+}
+
+/* WebKit does not honor alignment for text specified via placeholder attribute.
+ * This CSS is a workaround. Please remove once WebKit bug is fixed.
+ * https://bugs.webkit.org/show_bug.cgi?id=63367
+ */
+html[dir='rtl'] input.weakrtl::-webkit-input-placeholder,
+html[dir='rtl'] .weakrtl input::-webkit-input-placeholder {
+  direction: rtl;
+}
+
+/* Default state **************************************************************/
+
+:-webkit-any(button,
+             input[type='button'],
+             input[type='submit']):not(.custom-appearance):not(.link-button),
+select,
+input[type='checkbox'],
+input[type='radio'] {
+  -webkit-appearance: none;
+  -webkit-user-select: none;
+  background-image: linear-gradient(#ededed, #ededed 38%, #dedede);
+  border: 1px solid rgba(0, 0, 0, 0.25);
+  border-radius: 2px;
+  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.08),
+      inset 0 1px 2px rgba(255, 255, 255, 0.75);
+  color: #444;
+  font: inherit;
+  margin: 0 1px 0 0;
+  outline: none;
+  text-shadow: 0 1px 0 rgb(240, 240, 240);
+}
+
+:-webkit-any(button,
+             input[type='button'],
+             input[type='submit']):not(.custom-appearance):not(.link-button),
+select {
+  min-height: 2em;
+  min-width: 4em;
+<if expr="is_win">
+  /* The following platform-specific rule is necessary to get adjacent
+   * buttons, text inputs, and so forth to align on their borders while also
+   * aligning on the text's baselines. */
+  padding-bottom: 1px;
+</if>
+}
+
+:-webkit-any(button,
+             input[type='button'],
+             input[type='submit']):not(.custom-appearance):not(.link-button) {
+  -webkit-padding-end: 10px;
+  -webkit-padding-start: 10px;
+}
+
+select {
+  -webkit-appearance: none;
+  -webkit-padding-end: 20px;
+  -webkit-padding-start: 6px;
+  /* OVERRIDE */
+  background-image: url("../../../ui/webui/resources/images/select.png"),
+      linear-gradient(#ededed, #ededed 38%, #dedede);
+  background-position: right center;
+  background-repeat: no-repeat;
+}
+
+html[dir='rtl'] select {
+  background-position: center left;
+}
+
+input[type='checkbox'] {
+  bottom: 2px;
+  height: 13px;
+  position: relative;
+  vertical-align: middle;
+  width: 13px;
+}
+
+input[type='radio'] {
+  /* OVERRIDE */
+  border-radius: 100%;
+  bottom: 3px;
+  height: 15px;
+  position: relative;
+  vertical-align: middle;
+  width: 15px;
+}
+
+/* TODO(estade): add more types here? */
+input[type='number'],
+input[type='password'],
+input[type='search'],
+input[type='text'],
+input[type='url'],
+input:not([type]),
+textarea {
+  border: 1px solid #bfbfbf;
+  border-radius: 2px;
+  box-sizing: border-box;
+  color: #444;
+  font: inherit;
+  margin: 0;
+  /* Use min-height to accommodate addditional padding for touch as needed. */
+  min-height: 2em;
+  padding: 3px;
+  outline: none;
+<if expr="is_win or is_macosx or is_ios">
+  /* For better alignment between adjacent buttons and inputs. */
+  padding-bottom: 4px;
+</if>
+}
+
+input[type='search'] {
+  -webkit-appearance: textfield;
+  /* NOTE: Keep a relatively high min-width for this so we don't obscure the end
+   * of the default text in relatively spacious languages (i.e. German). */
+  min-width: 160px;
+}
+
+/* Remove when https://bugs.webkit.org/show_bug.cgi?id=51499 is fixed.
+ * TODO(dbeam): are there more types that would benefit from this? */
+input[type='search']::-webkit-textfield-decoration-container {
+  direction: inherit;
+}
+
+/* Checked ********************************************************************/
+
+input[type='checkbox']:checked::before {
+  -webkit-user-select: none;
+  background-image: url("../../../ui/webui/resources/images/check.png");
+  background-size: 100% 100%;
+  content: '';
+  display: block;
+  height: 100%;
+  width: 100%;
+}
+
+input[type='radio']:checked::before {
+  background-color: #666;
+  border-radius: 100%;
+  bottom: 3px;
+  content: '';
+  display: block;
+  left: 3px;
+  position: absolute;
+  right: 3px;
+  top: 3px;
+}
+
+/* Hover **********************************************************************/
+
+:enabled:hover:-webkit-any(
+    select,
+    input[type='checkbox'],
+    input[type='radio'],
+    :-webkit-any(
+        button,
+        input[type='button'],
+        input[type='submit']):not(.custom-appearance):not(.link-button)) {
+  background-image: linear-gradient(#f0f0f0, #f0f0f0 38%, #e0e0e0);
+  border-color: rgba(0, 0, 0, 0.3);
+  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.12),
+      inset 0 1px 2px rgba(255, 255, 255, 0.95);
+  color: black;
+}
+
+:enabled:hover:-webkit-any(select) {
+  /* OVERRIDE */
+  background-image: url("../../../ui/webui/resources/images/select.png"),
+      linear-gradient(#f0f0f0, #f0f0f0 38%, #e0e0e0);
+}
+
+/* Active *********************************************************************/
+
+:enabled:active:-webkit-any(
+    select,
+    input[type='checkbox'],
+    input[type='radio'],
+    :-webkit-any(
+        button,
+        input[type='button'],
+        input[type='submit']):not(.custom-appearance):not(.link-button)) {
+  background-image: linear-gradient(#e7e7e7, #e7e7e7 38%, #d7d7d7);
+  box-shadow: none;
+  text-shadow: none;
+}
+
+:enabled:active:-webkit-any(select) {
+  /* OVERRIDE */
+  background-image: url("../../../ui/webui/resources/images/select.png"),
+      linear-gradient(#e7e7e7, #e7e7e7 38%, #d7d7d7);
+}
+
+/* Disabled *******************************************************************/
+
+:disabled:-webkit-any(
+    button,
+    input[type='button'],
+    input[type='submit']):not(.custom-appearance):not(.link-button),
+select:disabled {
+  background-image: linear-gradient(#f1f1f1, #f1f1f1 38%, #e6e6e6);
+  border-color: rgba(80, 80, 80, 0.2);
+  box-shadow: 0 1px 0 rgba(80, 80, 80, 0.08),
+      inset 0 1px 2px rgba(255, 255, 255, 0.75);
+  color: #aaa;
+}
+
+select:disabled {
+  /* OVERRIDE */
+  background-image: url("../../../ui/webui/resources/images/disabled_select.png"),
+      linear-gradient(#f1f1f1, #f1f1f1 38%, #e6e6e6);
+}
+
+input:disabled:-webkit-any([type='checkbox'],
+                           [type='radio']) {
+  opacity: .75;
+}
+
+input:disabled:-webkit-any([type='password'],
+                           [type='search'],
+                           [type='text'],
+                           [type='url'],
+                           :not([type])) {
+  color: #999;
+}
+
+/* Focus **********************************************************************/
+
+:enabled:focus:-webkit-any(
+    select,
+    input[type='checkbox'],
+    input[type='number'],
+    input[type='password'],
+    input[type='radio'],
+    input[type='search'],
+    input[type='text'],
+    input[type='url'],
+    input:not([type]),
+    :-webkit-any(
+         button,
+         input[type='button'],
+         input[type='submit']):not(.custom-appearance):not(.link-button)) {
+  /* OVERRIDE */
+  -webkit-transition: border-color 200ms;
+  /* We use border color because it follows the border radius (unlike outline).
+   * This is particularly noticeable on mac. */
+  border-color: rgb(77, 144, 254);
+  outline: none;
+}
+
+/* Link buttons ***************************************************************/
+
+.link-button {
+  box-shadow: none;
+  background: transparent none;
+  border: none;
+  color: rgb(17, 85, 204);
+  cursor: pointer;
+  /* Input elements have -webkit-small-control which can override the body font.
+   * Resolve this by using 'inherit'. */
+  font: inherit;
+  margin: 0;
+  padding: 0 4px;
+}
+
+.link-button:hover {
+  text-decoration: underline;
+}
+
+.link-button:active {
+  color: rgb(5, 37, 119);
+  text-decoration: underline;
+}
+
+.link-button[disabled] {
+  color: #999;
+  cursor: default;
+  text-decoration: none;
+}
+
+/* Checkbox/radio helpers ******************************************************
+ *
+ * .checkbox and .radio classes wrap labels. Checkboxes and radios should use
+ * these classes with the markup structure:
+ *
+ *   <div class="checkbox">
+ *     <label>
+ *       <input type="checkbox"></input>
+ *       <span>
+ *     </label>
+ *   </div>
+ */
+
+:-webkit-any(.checkbox, .radio) label {
+  /* Don't expand horizontally: <http://crbug.com/112091>. */
+  display: inline-flex;
+  padding-bottom: 7px;
+  padding-top: 7px;
+}
+
+:-webkit-any(.checkbox, .radio) label input ~ span {
+  -webkit-margin-start: 0.6em;
+  /* Make sure long spans wrap at the same horizontal position they start. */
+  display: block;
+}
+
+:-webkit-any(.checkbox, .radio) label:hover {
+  color: black;
+}
+
+label > input:disabled:-webkit-any([type='checkbox'], [type='radio']) ~ span {
+  color: #999;
+}