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<!doctype html>
<title>CSS Whitespace</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<meta name="author" title="Tab Atkins-Bittner">
<link rel=help href="https://drafts.csswg.org/css-syntax/#whitespace">
<div class=a><b></b></div>
<div id=foo></div>
<!--
CSS's definition of "whitespace" matches HTML,
and includes only the five ASCII characters
U+0009, U+000A, U+000C, U+000D, and U+0020.
The rest of Unicode's whitespace characters,
many of which are recognized as whitespace by JS,
are not valid whitespace in CSS.
-->
<script>
function isWhitespace(codepoint) {
const char = String.fromCodePoint(codepoint);
const codepointName = "U+" + codepoint.toString(16).padStart(4, "0");
test(()=>{
const withSpace = document.querySelector(".a b");
const withChar = document.querySelector(`.a${char}b`);
assert_equals(withSpace, withChar);
}, `${codepointName} is CSS whitespace`);
}
function isNotWhitespace(codepoint) {
const char = String.fromCodePoint(codepoint);
const codepointName = "U+" + codepoint.toString(16).padStart(4, "0");
test(()=>{
const withSpace = document.querySelector(".a b");
document.querySelector("#foo").setAttribute("class", `.a${char}b`);
try {
var withChar = document.querySelector(`.a${char}b`);
} catch(e) {
assert_true(true, `${codepointName} isn't valid in a selector at all`);
return;
}
assert_not_equals(withSpace, withChar);
}, `${codepointName} is *not* CSS whitespace`);
}
// CSS Whitespace characters
var whitespace = [0x9, 0xa, 0xc, 0xd, 0x20];
// Unicode Whitespace characters not recognized by CSS
// https://en.wikipedia.org/wiki/Whitespace_character#Unicode
var notWhitespace = [0xb, 0x85, 0xa0, 0x1680, 0x2000, 0x2001, 0x2002, 0x2003, 0x2004, 0x2005, 0x2006, 0x2007, 0x2008, 0x2009, 0x200a, 0x2928, 0x2029, 0x202f, 0x205f, 0x3000, 0x180e, 0x200b, 0x200c, 0x200d, 0x2060, 0xfeff];
for(var codepoint of whitespace) {
isWhitespace(codepoint);
}
for(var codepoint of notWhitespace) {
isNotWhitespace(codepoint);
}
</script>
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