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<!DOCTYPE html>
<meta charset="utf-8">
<title>View transitions: CSSOM for @view-transition rule</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-2/">
<link rel="author" href="mailto:bokan@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style></style>
<script>
function resetStateAndTest(testFunction) {
const sheet = document.styleSheets[0];
while (sheet.cssRules.length > 0) sheet.deleteRule(0);
testFunction();
}
test(function () {
resetStateAndTest(() => {
document.styleSheets[0].insertRule(`
@view-transition {
}
`);
let rule = document.styleSheets[0].cssRules[0];
assert_true(rule instanceof CSSViewTransitionRule);
assert_equals(rule.type, 0);
assert_equals(rule.cssText, "@view-transition { }");
assert_equals(rule.navigation, '');
});
}, "CSSViewTransitionRule is correctly parsed and accessible via CSSOM.");
test(function () {
resetStateAndTest(() => {
document.styleSheets[0].insertRule(`
@view-transition {
navigation: auto;
}
`);
let rule = document.styleSheets[0].cssRules[0];
assert_equals(rule.cssText,
"@view-transition { navigation: auto; }");
assert_equals(rule.navigation, 'auto');
});
}, "`navigation: auto` is correctly parsed.");
test(function () {
resetStateAndTest(() => {
document.styleSheets[0].insertRule(`
@view-transition {
navigation: none;
}
`);
let rule = document.styleSheets[0].cssRules[0];
assert_equals(rule.cssText, "@view-transition { navigation: none; }");
assert_equals(rule.navigation, 'none');
});
}, "`navigation: none` is correctly parsed.");
test(function () {
resetStateAndTest(() => {
assert_throws_dom('SyntaxError', () => {
document.styleSheets[0].insertRule('@view-transition foo {}');
}, "Failed to execute 'insertRule' on 'CSSStyleSheet': " +
"Failed to parse the rule '@view-transition foo {}'");
assert_equals(document.styleSheets[0].cssRules.length, 0);
});
}, "@view-transition fails parsing with a preamble");
test(function () {
resetStateAndTest(() => {
document.styleSheets[0].insertRule(`
@view-transition {
navigation: foo;
}
`);
let rule = document.styleSheets[0].cssRules[0];
assert_equals(rule.cssText, "@view-transition { }");
});
}, "Invalid `navigation` value fails to parse.");
test(function () {
resetStateAndTest(() => {
document.styleSheets[0].insertRule(`
@view-transition {
navigation: none !important;
}
`);
let rule = document.styleSheets[0].cssRules[0];
assert_equals(rule.cssText, "@view-transition { }");
});
}, "`navigation` with !important flag should fail to parse.");
test(function () {
resetStateAndTest(() => {
document.styleSheets[0].insertRule(`
@view-transition {
navigation: none;
}
`);
let rule = document.styleSheets[0].cssRules[0];
rule.navigation = "auto";
assert_equals(rule.navigation, "none");
});
}, "`navigation` descriptor cannot be set.");
</script>
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