[cssom-view] window.open() feature names are case-insensitive.

Author: Simon Pieters

cssom-view/Overview.html

@@ -720,7 +720,8 @@ <h4 id="the-features-argument-to-the-open()-method"><span class="secno">5.1 </sp
    <li><p>Let <var>position</var> point at the first character of <var>input</var>.
    <li><p><a class="external" data-anolis-spec="html" href="http://www.whatwg.org/specs/web-apps/current-work/multipage/common-microsyntaxes.html#skip-whitespace">Skip whitespace</a>.
    <li><p><a class="external" data-anolis-spec="html" href="http://www.whatwg.org/specs/web-apps/current-work/multipage/common-microsyntaxes.html#collect-a-sequence-of-characters">Collect a sequence of characters</a> that are not <a class="external" data-anolis-spec="html" href="http://www.whatwg.org/specs/web-apps/current-work/multipage/common-microsyntaxes.html#space-character" title="space character">space
-   characters</a> nor "<code title="">=</code>" (U+003D). Let <var>name</var> be the collected characters.
+   characters</a> nor "<code title="">=</code>" (U+003D). Let <var>name</var> be the collected characters, <a class="external" data-anolis-spec="dom" href="http://dom.spec.whatwg.org/#converted-to-ascii-lowercase">converted to ASCII
+   lowercase</a>.
    <li><p>If <var>name</var> is in <var>parsed features</var> or if <var>name</var> is not a <a href="#supported-open()-feature-name">supported <code title="">open()</code> feature name</a>,
    continue <i>token loop</i>.
    <li><p><a class="external" data-anolis-spec="html" href="http://www.whatwg.org/specs/web-apps/current-work/multipage/common-microsyntaxes.html#skip-whitespace">Skip whitespace</a>.

cssom-view/Overview.src.html

@@ -681,7 +681,8 @@ <h4>The <var>features</var> argument to the <code title>open()</code> method</h4
    <li><p>Let <var>position</var> point at the first character of <var>input</var>.
    <li><p><span data-anolis-spec=html>Skip whitespace</span>.
    <li><p><span data-anolis-spec=html>Collect a sequence of characters</span> that are not <span data-anolis-spec=html title="space character">space
-   characters</span> nor "<code title>=</code>" (U+003D). Let <var>name</var> be the collected characters.
+   characters</span> nor "<code title>=</code>" (U+003D). Let <var>name</var> be the collected characters, <span data-anolis-spec=dom>converted to ASCII
+   lowercase</span>.
    <li><p>If <var>name</var> is in <var>parsed features</var> or if <var>name</var> is not a <span>supported <code title>open()</code> feature name</span>,
    continue <i>token loop</i>.
    <li><p><span data-anolis-spec=html>Skip whitespace</span>.