Blitz - WPT: systemLanguage-parsing.html

wpt / svg / struct / systemLanguage-parsing.html

Data from commit:
a50cb89 wpt: run reference-named files which are themselves tests (#836) (2026-09-03)

Subtest	Status	Message
Comma-separated tokens are split into individual items	FAIL	cannot convert 'null' or 'undefined' to object
Whitespace after comma is stripped	FAIL	cannot convert 'null' or 'undefined' to object
Whitespace before comma is stripped	FAIL	cannot convert 'null' or 'undefined' to object
Whitespace around commas is stripped	FAIL	cannot convert 'null' or 'undefined' to object
Leading and trailing whitespace on the value is stripped	FAIL	cannot convert 'null' or 'undefined' to object
Tabs and newlines as leading/trailing whitespace are stripped	FAIL	cannot convert 'null' or 'undefined' to object
Single token without commas	FAIL	cannot convert 'null' or 'undefined' to object
BCP 47 subtags are preserved within tokens	FAIL	cannot convert 'null' or 'undefined' to object
Double comma produces an empty token between the two commas	FAIL	cannot convert 'null' or 'undefined' to object
Empty string results in a single empty token	FAIL	cannot convert 'null' or 'undefined' to object
A single comma separates two empty tokens	FAIL	cannot convert 'null' or 'undefined' to object
Numeric tokens are parsed without validation	FAIL	cannot convert 'null' or 'undefined' to object
Invalid language tags are stored as tokens without validation	FAIL	cannot convert 'null' or 'undefined' to object

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/svg/struct/systemLanguage-parsing.html

<!DOCTYPE html>
<title>systemLanguage attribute is parsed as comma-separated tokens</title>
<link rel="help" href="https://w3c.github.io/svgwg/svg2-draft/struct.html#ConditionalProcessingSystemLanguageAttribute">
<link rel="help" href="https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#set-of-comma-separated-tokens">
<meta name="assert" content="The systemLanguage attribute value is a set of comma-separated tokens per SVG2. Each token is trimmed of surrounding ASCII whitespace.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
function parsesAs(input, expected, description) {
    test(() => {
        const el = document.createElementNS("http://www.w3.org/2000/svg", "text");
        el.setAttribute("systemLanguage", input);
        const list = el.systemLanguage;
        assert_equals(list.length, expected.length, "token count");
        for (let i = 0; i < expected.length; i++)
            assert_equals(list.getItem(i), expected[i], `token ${i}`);
    }, description);
}

// SVG2: "The value is a set of comma-separated tokens, each of which must be
// a Language-Tag value, as defined in BCP 47."
//
// HTML: "A set of comma-separated tokens is a string containing zero or more
// tokens each separated from the next by a single U+002C COMMA character (,),
// where tokens consist of any string of zero or more characters, neither
// beginning nor ending with ASCII whitespace, nor containing any U+002C COMMA
// characters (,), and optionally surrounded by ASCII whitespace."

parsesAs("en,fr,de", ["en", "fr", "de"],
    "Comma-separated tokens are split into individual items");

parsesAs("en, fr, de", ["en", "fr", "de"],
    "Whitespace after comma is stripped");

parsesAs("en ,fr ,de", ["en", "fr", "de"],
    "Whitespace before comma is stripped");

parsesAs("en , fr , de", ["en", "fr", "de"],
    "Whitespace around commas is stripped");

parsesAs("  en, fr  ", ["en", "fr"],
    "Leading and trailing whitespace on the value is stripped");

parsesAs(" \t\nen, fr\t\n ", ["en", "fr"],
    "Tabs and newlines as leading/trailing whitespace are stripped");

parsesAs("en", ["en"],
    "Single token without commas");

// "each of which must be a Language-Tag value, as defined in BCP 47"
// BCP 47 tags use hyphens for subtags (e.g. "en-US", "zh-Hans").
// Hyphens are not separators — only commas are.
parsesAs("en-US, zh-Hans, pt-BR", ["en-US", "zh-Hans", "pt-BR"],
    "BCP 47 subtags are preserved within tokens");

// Edge cases: the parser does not validate token content.
// Invalid BCP 47 tags are stored as-is. They simply won't match
// any user language, so the element won't render.

// Double comma — per the HTML comma-separated token spec, the empty
// string between consecutive commas is a valid token.
// https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#set-of-comma-separated-tokens
// Example from spec: " a ,b,,d d " → ["a", "b", "", "d d"]
parsesAs("en,,fr", ["en", "", "fr"],
    "Double comma produces an empty token between the two commas");

// "zero or more tokens" — an empty string yields an empty list.
// SVG2: "If a null string or empty string value is given to attribute
// 'systemLanguage', the attribute evaluates to 'false'."
parsesAs("", [""],
    "Empty string results in a single empty token");

// A lone comma separates two empty tokens per the HTML spec.
parsesAs(",", ["", ""],
    "A single comma separates two empty tokens");

// Numeric strings are not valid BCP 47 tags but are stored as tokens.
parsesAs("123, 456", ["123", "456"],
    "Numeric tokens are parsed without validation");

// Arbitrary invalid strings are stored as tokens without validation.
parsesAs("not-a-lang, ???, @#$", ["not-a-lang", "???", "@#$"],
    "Invalid language tags are stored as tokens without validation");
</script>