css/css-syntax/escaped-eof.html

<!doctype html>
<title>Escaped EOF</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/#consume-escaped-code-point">
<link rel=help href="https://drafts.csswg.org/css-syntax/#consume-string-token">
<link rel=help href="https://drafts.csswg.org/css-syntax/#consume-token">

<style>foo { --foo:foo\</style>
<style>foo { --foo:1foo\</style>
<style>foo { --foo:url(foo\</style>
<style>foo { --foo:"foo\</style>

<script>
test(()=>{
    assert_throws_dom("SyntaxError", ()=>{document.querySelector("#123");}, "numeric hash token is invalid in a selector");
    document.querySelector("#foo\\"); // escaped-EOF in a hash token is valid in a selector
}, "Escaped EOF turns into a U+FFFD in a hash token, makes it 'ID' type.");

test(()=>{
    const sh = document.styleSheets[0];
    const val = sh.cssRules[0].style.getPropertyValue("--foo");
    assert_equals("foo\ufffd", val);
}, "Escaped EOF turns into a U+FFFD in an ident token.");

test(()=>{
    const sh = document.styleSheets[1];
    const val = sh.cssRules[0].style.getPropertyValue("--foo");
    assert_equals("1foo\ufffd", val);
}, "Escaped EOF turns into a U+FFFD in a dimension token.");

test(()=>{
    const sh = document.styleSheets[2];
    const val = sh.cssRules[0].style.getPropertyValue("--foo");
    assert_equals("url(foo\ufffd)", val);
}, "Escaped EOF turns into a U+FFFD in a url token.");

test(()=>{
    const sh = document.styleSheets[3];
    const val = sh.cssRules[0].style.getPropertyValue("--foo");
    assert_equals(`"foo"`, val);
}, "Escaped EOF in a string is ignored.");

</script>