Add m-esr52 at 52.6.0

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+Some test may require special user style sheets to be applied in order
+for the case to be verified. In order for proper indications and
+prerequisite to be displayed every user style sheet should contain the
+following rules.
+
+``` css
+#user-stylesheet-indication
+{
+   /* Used by the harness to display an indication there is a user
+   style sheet applied */
+    display: block!important;
+}
+```
+
+The rule ```#user-stylesheet-indication``` is to be used by any
+harness running the test suite.
+
+A harness should identify test that need a user style sheet by
+looking at their flags meta tag. It then should display appropriate
+messages indicating if a style sheet is applied or if a style sheet
+should not be applied.
+
+Harness style sheet rules:
+
+``` css
+#userstyle
+{
+    color: green;
+    display: none;
+}
+#nouserstyle
+{
+    color: red;
+    display: none;
+}
+```
+
+Harness userstyle flag found:
+
+``` html
+<p id="user-stylesheet-indication" class="userstyle">A user style
+sheet is applied.</p>
+```
+
+Harness userstyle flag NOT found:
+
+``` html
+<p id="user-stylesheet-indication" class="nouserstyle">A user style
+sheet is applied.</p>
+```
+
+Within the test case it is recommended that the case itself indicate
+the necessary user style sheet that is required.
+
+Examples: (code for the [`cascade.css`][cascade-css] file)
+
+``` css
+#cascade /* ID name should match user style sheet file name */
+{
+    /* Used by the test to hide the prerequisite */
+    display: none;
+}
+```
+
+The rule ```#cascade``` in the example above is used by the test
+page to hide the prerequisite text. The rule name should match the
+user style sheet CSS file name in order to keep this orderly.
+
+Examples: (code for [the `cascade-###.xht` files][cascade-xht])
+
+``` html
+<p id="cascade">
+    PREREQUISITE: The <a href="support/cascade.css">
+    "cascade.css"</a> file is enabled as the user agent's user style
+    sheet.
+</p>
+```
+
+The id value should match the user style sheet CSS file name and the
+user style sheet rule that is used to hide this text when the style
+sheet is properly applied.
+
+Please flag test that require user style sheets with the userstyle
+flag so people running the tests know that a user style sheet is
+required.
+
+[cascade-css]: https://github.com/w3c/csswg-test/blob/master/css21/cascade/support/cascade.css
+[cascade-xht]: https://github.com/w3c/csswg-test/blob/master/css21/cascade/cascade-001.xht