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<!doctype html>
<meta charset="utf-8">
<title>@import rule with supports parsing / serialization</title>
<link rel="author" href="mailto:oj@oojmed.com">
<link rel="help" href="https://drafts.csswg.org/css-cascade-4/#at-import">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
function setupSheet(rule) {
const style = document.createElement("style");
document.head.append(style);
const {sheet} = style;
const {cssRules} = sheet;
assert_equals(cssRules.length, 0, "Sheet should have no rules");
sheet.insertRule(rule);
assert_equals(cssRules.length, 1, "Sheet should have 1 rule");
return {sheet, cssRules};
}
function test_valid_supports_import(rule, serialized) {
if (serialized === undefined)
serialized = rule;
test(function() {
const {sheet, cssRules} = setupSheet(rule);
const serialization = cssRules[0].cssText;
assert_equals(serialization, serialized, 'serialization should be canonical');
sheet.deleteRule(0);
assert_equals(cssRules.length, 0, 'Sheet should have no rule');
sheet.insertRule(serialization);
assert_equals(cssRules.length, 1, 'Sheet should have 1 rule');
assert_equals(cssRules[0].cssText, serialization, 'serialization should round-trip');
}, rule + ' should be a valid supports() import rule');
}
function test_unsupported_supports_import(rule) {
test(function() {
const {sheet, cssRules} = setupSheet(rule);
sheet.deleteRule(0);
assert_equals(cssRules.length, 0, 'Sheet should have no rule');
}, rule + ' should still be a valid import rule with an invalid supports() declaration');
}
function test_invalid_supports_import(rule) {
test(function() {
const style = document.createElement("style");
document.head.append(style);
const {sheet} = style;
const {cssRules} = sheet;
assert_equals(cssRules.length, 0, "Sheet should have no rules");
}, rule + ' should be an invalid import rule due to an invalid supports() declaration');
}
test_invalid_supports_import('@import url("nonexist.css") supports();');
test_invalid_supports_import('@import url("nonexist.css") supports(foo: bar);');
test_valid_supports_import('@import url("nonexist.css") supports(display:block);');
test_valid_supports_import('@import url("nonexist.css") supports((display:flex));');
test_valid_supports_import('@import url("nonexist.css") supports(not (display: flex));');
test_valid_supports_import('@import url("nonexist.css") supports((display: flex) and (display: block));');
test_valid_supports_import('@import url("nonexist.css") supports((display: flex) or (display: block));');
test_valid_supports_import('@import url("nonexist.css") supports((display: flex) or (foo: bar));');
test_valid_supports_import('@import url("nonexist.css") supports(display: block !important);');
test_invalid_supports_import('@import url("nonexist.css") layer supports();');
test_invalid_supports_import('@import url("nonexist.css") layer supports(foo: bar);');
test_valid_supports_import('@import url("nonexist.css") layer(A) supports((display: flex) or (foo: bar));');
test_valid_supports_import('@import url("nonexist.css") layer(A.B) supports((display: flex) and (foo: bar));');
test_valid_supports_import('@import url("nonexist.css") supports(selector(a));');
test_valid_supports_import('@import url("nonexist.css") supports(selector(p a));');
test_valid_supports_import('@import url("nonexist.css") supports(selector(p > a));');
test_valid_supports_import('@import url("nonexist.css") supports(selector(p + a));');
test_valid_supports_import('@import url("nonexist.css") supports(font-tech(color-colrv1));');
test_valid_supports_import('@import url("nonexist.css") supports(font-format(opentype));');
test_valid_supports_import('@import url(nonexist.css) supports(display:block);',
'@import url("nonexist.css") supports(display:block);');
test_valid_supports_import('@import "nonexist.css" supports(display:block);',
'@import url("nonexist.css") supports(display:block);');
// “supports” gets parsed as an (unsupported) media query.
test_unsupported_supports_import('@import url("nonexist.css") supports;');
</script>
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