Indicate default html namespace for all UA rules.

The html.css sheet uses the html namespace as the default namespace, and
various sheets are appended to that sheet before parsing. Indicate that
these sheets also have this default namespace.

Change-Id: I19c8bd74ce6c53615291ae8464576ea59d2d159e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2145886Reviewed-by: Rob Buis <rbuis@igalia.com>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758826}

third_party/blink/renderer/core/html/resources/android.css

@@ -30,6 +30,12 @@
 
 /* These styles override other user-agent styles for Chromium on Android. */
 
+/* This sheet is appended to html.css before parsing which means the selectors
+   below are in the default html namespace:
+
+   @namespace "http://www.w3.org/1999/xhtml"
+*/
+
 input[type="date" i]:disabled,
 input[type="datetime-local" i]:disabled,
 input[type="month" i]:disabled,

third_party/blink/renderer/core/html/resources/controls_refresh.css

@@ -8,6 +8,12 @@
  * using the refreshed controls UI.
  */
 
+/* This sheet is appended to html.css before parsing which means the selectors
+   below are in the default html namespace:
+
+   @namespace "http://www.w3.org/1999/xhtml"
+*/
+
 select,
 select:-internal-list-box,
 input,

third_party/blink/renderer/core/html/resources/forced_colors.css

@@ -8,6 +8,12 @@
  * is enabled.
  */
 
+/* This sheet is appended to html.css before parsing which means the selectors
+   below are in the default html namespace:
+
+   @namespace "http://www.w3.org/1999/xhtml"
+*/
+
 @media forced-colors {
   body {
     background-color: Canvas;
@@ -223,4 +229,4 @@
     background-color: Window !important;
   }
 
-}
+}
\ No newline at end of file

third_party/blink/renderer/core/html/resources/input_multiple_fields.css

@@ -3,6 +3,12 @@
  * found in the LICENSE file.
  */
 
+/* This sheet is appended to html.css before parsing which means the selectors
+   below are in the default html namespace:
+
+   @namespace "http://www.w3.org/1999/xhtml"
+*/
+
 input[type="date" i],
 input[type="datetime-local" i],
 input[type="month" i],

third_party/blink/renderer/core/html/resources/linux.css

@@ -30,6 +30,12 @@
 
 /* These styles override other user-agent styles for Chromium on Linux. */
 
+/* This sheet is appended to html.css before parsing which means the selectors
+   below are in the default html namespace:
+
+   @namespace "http://www.w3.org/1999/xhtml"
+*/
+
 select:not(:-internal-list-box) {
     /* Selects with popup menus look like buttons with a drop down triangle on Linux. */
     background-color: ButtonFace;

third_party/blink/renderer/core/html/resources/mac.css

@@ -3,6 +3,12 @@
  * found in the LICENSE file.
  */
 
+/* This sheet is appended to html.css before parsing which means the selectors
+   below are in the default html namespace:
+
+   @namespace "http://www.w3.org/1999/xhtml"
+*/
+
 select, input[type="color" i][list] {
     /* TODO(tkent): Use ButtonFace and border same as buttons. */
     background-color: #f8f8f8;

third_party/blink/renderer/core/html/resources/quirks.css

@@ -21,6 +21,12 @@
  *
  */
 
+/* This sheet is appended to html.css before parsing which means the selectors
+   below are in the default html namespace:
+
+   @namespace "http://www.w3.org/1999/xhtml"
+*/
+
 /* Give floated images margins of 3px */
 img[align="left" i] {
     margin-right: 3px;

third_party/blink/renderer/core/html/resources/win.css

@@ -32,6 +32,12 @@
    core/html/resources/tml.css. So far we have used this file exclusively
    for making our form elements match Firefox's. */
 
+/* This sheet is appended to html.css before parsing which means the selectors
+   below are in the default html namespace:
+
+   @namespace "http://www.w3.org/1999/xhtml"
+*/
+
 /*
  * Update padding for all text-like types including unknown types.
  * Non-text types have input[type="foo" i] with padding properties in

third_party/blink/renderer/core/html/resources/win_quirks.css

@@ -32,6 +32,12 @@
    as defined in core/html/resources/quirks.css. So far we have used this
    file exclusively for making our form elements match Firefox's. */
 
+/* This sheet is appended to html.css before parsing which means the selectors
+   below are in the default html namespace:
+
+   @namespace "http://www.w3.org/1999/xhtml"
+*/
+
 textarea {
   /* Matches IE's text offsets in quirksmode (causes text to wrap the same as IE). */
   padding: 2px 0 0 2px;