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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-break/page-break-legacy-shorthands.html - WPT Dashboard Interop Dashboard
<!doctype html>
<meta charset="utf-8">
<title>Test for the page-break-* legacy shorthands.</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../support/shorthand-testcommon.js"></script>
<div></div>
<script>
const NEW_VALUES = ["page", "column"].filter(v => CSS.supports("break-before", v));
const LEGACY_VALUES = ["always", "auto", "left", "right", "avoid"];
const LEGACY_MAPPING = { "always": "page" };
const REVERSE_LEGACY_MAPPING = { "page": "always" };
const div = document.querySelector("div");
const cs = getComputedStyle(div);
test(function() {
for (const property of ["break-before", "break-after"]) {
for (const val of LEGACY_VALUES) {
const mapped_value = LEGACY_MAPPING[val] || val;
div.style["page-" + property] = val;
assert_equals(div.style["page-" + property], val);
assert_equals(div.style[property], mapped_value);
assert_equals(cs.getPropertyValue("page-" + property), val);
assert_equals(cs.getPropertyValue(property), mapped_value);
assert_not_equals(div.style.cssText.indexOf(property + ": " + mapped_value + ";"), -1);
assert_equals(div.style.cssText.indexOf("page-" + property), -1,
"Legacy shorthands don't appear in cssText");
}
}
}, "Legacy values of the shorthands work as expected")
test(function() {
for (const property of ["break-before", "break-after"]) {
for (const val of NEW_VALUES) {
const mapped_value = REVERSE_LEGACY_MAPPING[val] || "";
div.style[property] = val;
assert_equals(div.style[property], val);
assert_equals(div.style["page-" + property], mapped_value);
assert_equals(cs.getPropertyValue("page-" + property), mapped_value);
assert_equals(cs.getPropertyValue(property), val);
}
}
}, "New values work on the new longhands, but serialize to the empty string in the legacy shorthands");
test(function() {
for (const property of ["break-before", "break-after"]) {
for (const val of NEW_VALUES) {
div.style["page-" + property] = "";
div.style["page-" + property] = val;
assert_equals(div.style["page-" + property], "");
assert_equals(div.style[property], "");
assert_equals(cs.getPropertyValue("page-" + property), "auto");
assert_equals(cs.getPropertyValue(property), "auto");
}
}
}, "New values of the break longhands don't work on legacy shorthands");
test(function() {
for (const property of ["break-before", "break-after"]) {
div.style["page-" + property] = "var(--a)";
assert_equals(div.style["page-" + property], "var(--a)");
assert_equals(div.style[property], "");
assert_equals(div.style.cssText.indexOf("page-" + property), -1);
}
}, "Legacy shorthands really never appear on cssText, even when there are variable references");
test_is_legacy_shorthand("page-break-before", "break-before");
test_is_legacy_shorthand("page-break-after", "break-after");
test_is_legacy_shorthand("page-break-inside", "break-inside");
</script>