<!DOCTYPE html>
<title>CSS Media Query Test: update media feature</title>
<link rel="help" href="https://drafts.csswg.org/mediaqueries-4/#descdef-media-update">
<meta assert="The test is supposed to be run on fast computer displays as it will no match otherwise. The definition of fast can be found in the spec link.">
<script type="text/javascript" src="/resources/testharness.js"></script>
<script type="text/javascript" src="/resources/testharnessreport.js"></script>
<script type="text/javascript" src="resources/matchmedia-utils.js"></script>
<script>
query_should_be_known("(update)");
query_should_be_known("(update: none)");
query_should_be_known("(update: slow)");
query_should_be_known("(update: fast)");
query_should_be_unknown("(update: ?)");
query_should_be_unknown("(update: 10px)");
query_should_be_unknown("(update: 0)");
test(() => {
let match_standard = window.matchMedia("(update: fast)");
assert_true(match_standard.matches);
}, "Check that update: fast always matches fast displays");
test(() => {
let match_standard = window.matchMedia("(update: slow)");
assert_false(match_standard.matches);
}, "Check that update: slow doesn't match fast displays");
test(() => {
let match_standard = window.matchMedia("(update: none)");
assert_false(match_standard.matches);
}, "Check that update: none doesn't match fast displays");
test(() => {
let match_standard = window.matchMedia("(update)");
assert_true(match_standard.matches);
}, "Check that update always matches non printing documents");
</script>
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