CSS: Test inheritance of clear and float

clear and float are discussed in
https://github.com/w3c/csswg-drafts/blob/master/css-box-3/block-layout.bs#L3158
https://github.com/w3c/csswg-drafts/blob/master/css-box-3/block-layout.bs#L2747
and in https://www.w3.org/TR/CSS2/

They have initial value 'none' and do not inherit.

Change-Id: Iefbbc98de4acb6a1d581f4e1a9db1af51938fa0f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1741436
Reviewed-by: Rune Lillesveen <[email protected]>
Commit-Queue: Eric Willigers <[email protected]>
Cr-Commit-Position: refs/heads/master@{#684734}

Author: ericwilligers

css/css-box/inheritance.html

@@ -4,6 +4,7 @@
 <meta charset="utf-8">
 <title>Inheritance of CSS Box Model properties</title>
 <link rel="help" href="https://drafts.csswg.org/css-box-3/#property-index">
+<link rel="help" href="https://www.w3.org/TR/CSS2/">
 <meta name="assert" content="Properties do not inherit.">
 <meta name="assert" content="length-percentage properties have initial value 0.">
 <script src="/resources/testharness.js"></script>
@@ -15,6 +16,9 @@
   <div id="target"></div>
 </div>
 <script>
+assert_not_inherited('clear', 'none', 'right');
+assert_not_inherited('float', 'none', 'right');
+
 assert_not_inherited('margin-bottom', '0px', '10px');
 assert_not_inherited('margin-left', '0px', '10px');
 assert_not_inherited('margin-right', '0px', '10px');