Base: Add a test page for the CSS :where() selector

This behaves identically to :is() except for specificity, so this test page is identical to the other one. It's not because I'm lazy. :^)
Cnidarias · Mar 18, 2022 · 47eb4b2 · 47eb4b2
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diff --git a/Base/res/html/misc/welcome.html b/Base/res/html/misc/welcome.html
@@ -96,8 +96,9 @@ <h2>CSS</h2>
  <li><a href="nth-last-of-type.html">:nth-last-of-type</a></li>
  <li><a href="empty.html">:empty</a></li>
  <li><a href="root.html">:root</a></li>
- <li><a href="is-selector.html">:is</a></li>
- <li><a href="not-selector.html">:not</a></li>
+ <li><a href="is-selector.html">:is()</a></li>
+ <li><a href="not-selector.html">:not()</a></li>
+ <li><a href="where-selector.html">:where()</a></li>
  <li><a href="hover.html">:hover</a></li>
  <li><h3>Properties</h3></li>
  <li><a href="backgrounds.html">Backgrounds</a></li>

diff --git a/Base/res/html/misc/where-selector.html b/Base/res/html/misc/where-selector.html
@@ -0,0 +1,38 @@
+<!doctype html>
+<html lang="en">
+<head>
+ <meta charset="utf-8">
+ <title>:where() test</title>
+ <style>
+ div {
+ border: 1px solid black;
+ margin-bottom: 1em;
+ padding: 0 0.5em;
+ }
+ .special :where(h2, p) {
+ background-color: lime;
+ }
+ .forgiving :where(&&&fakhsdaskjhd, h2, p) {
+ background-color: lime;
+ }
+ </style>
+</head>
+<body>
+ <h1>:where() test</h1>
+ <div>
+ <h2>Nothing</h2>
+ <p>These should have no background.</p>
+ </div>
+ <br/>
+ <div class="special">
+ <h2>.special :where(h2, p)</h2>
+ <p>These should have a green background.</p>
+ </div>
+ <br/>
+ <div class="forgiving">
+ <h2>.forgiving :where(&&&fakhsdaskjhd, h2, p)</h2>
+ <p>These should have a green background. :where() takes a "permissive selector list",
+ so even though part of it is invalid, this does not make the whole selector-list invalid.</p>
+ </div>
+</body>
+</html>