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<!DOCTYPE html>
<title>Test relList attribute</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
let link_support_table = {};
// https://html.spec.whatwg.org/multipage/links.html#linkTypes
link_support_table['link'] = {
supported : ['modulepreload', 'preload', 'preconnect', 'dns-prefetch',
'stylesheet', 'import', 'icon', 'alternate', 'prefetch',
'prerender', 'next', 'manifest', 'apple-touch-icon',
'apple-touch-icon-precomposed', 'canonical'],
unsupported : ['author', 'bookmark', 'external', 'help', 'license',
'nofollow', 'pingback', 'prev', 'search', 'tag',
'noreferrer', 'noopener']
};
link_support_table['a'] = {
supported : ['noreferrer', 'noopener'],
unsupported : ['author', 'bookmark', 'external', 'help', 'license',
'nofollow', 'pingback', 'prev', 'search', 'tag',
'modulepreload', 'preload', 'preconnect', 'dns-prefetch',
'stylesheet', 'import', 'icon', 'alternate', 'prefetch',
'prerender', 'next', 'manifest', 'apple-touch-icon',
'apple-touch-icon-precomposed', 'canonical']
};
link_support_table['area'] = link_support_table['a'];
function test_rellist(tag_name, rel_table) {
let element = document.createElement(tag_name);
let tag = element.tagName;
// Test that setting rel is also setting relList, for both
// valid and invalid values.
element.rel = 'whatever';
assert_true(element.relList.contains('whatever'), 'tag = ' + tag + ', setting rel must work');
element.rel = 'prefetch';
assert_true(element.relList.contains('prefetch'), 'tag = ' + tag + ', setting rel must work');
// Test that add() works.
element.relList.add('preloadwhatever');
assert_equals(element.rel, 'prefetch preloadwhatever', 'tag = ' + tag + ', add must work');
assert_true(element.relList.contains('preloadwhatever'), 'tag = ' + tag + ', add must work');
// Test that remove() works.
element.relList.remove('preloadwhatever');
assert_equals(element.rel, 'prefetch', 'tag = ' + tag + ', remove must work');
assert_false(element.relList.contains('preloadwhatever'), 'tag = ' + tag + ', remove must work');
// Test that toggle() works.
element.relList.toggle('prefetch', false);
assert_equals(element.rel, '', 'tag = ' + tag + ', toggle must work');
element.relList.toggle('prefetch', true);
assert_equals(element.rel, 'prefetch', 'tag = ' + tag + ', toggle must work');
// Test that replace() works.
element.relList.replace('prefetch', 'first');
assert_equals(element.rel, 'first', 'tag = ' + tag + ', replace must work');
// Test that indexed item getter works.
element.relList.add('second');
assert_equals(element.relList.length, 2, 'tag = ' + tag + ', relList length must be correct');
assert_equals(element.relList[0], 'first', 'tag = ' + tag + ', relList indexed item must work');
assert_equals(element.relList[1], 'second', 'tag = ' + tag + ', relList indexed item must work');
// Test that relList is [SameObject].
let savedRelList = element.relList;
element.rel = 'something';
assert_equals(element.relList, savedRelList, 'tag = ' + tag + ', SameObject must work');
// Test that supports() is returning true for valid values
// and false for invalid ones.
let supported = rel_table['supported'];
for (let link_type in supported) {
assert_true(element.relList.supports(supported[link_type]), 'tag = ' + tag + ', link type = ' + supported[link_type] + ' must be supported');
}
let unsupported = rel_table['unsupported'];
for (let link_type in unsupported) {
assert_false(element.relList.supports(unsupported[link_type]), 'tag = ' + tag + ', link type = ' + unsupported[link_type] + ' must be unsupported');
}
}
test(function() {
test_rellist('LINK', link_support_table['link']);
test_rellist('A', link_support_table['a']);
test_rellist('AREA', link_support_table['area']);
}, 'Make sure that relList based feature detection is working');
</script>
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