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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-highlight-api/HighlightRegistry-iteration-with-modifications.html - WPT Dashboard Interop Dashboard
<!doctype html>
<title>HighlightRegistry iteration with insertions and deletions inbetween</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
'use strict';
let customHighlight1 = new Highlight();
let customHighlight2 = new Highlight();
let highlightName1 = "example1";
let highlightName2 = "example2";
// Test insertions using .set
test(() => {
let iterator = CSS.highlights[Symbol.iterator]();
CSS.highlights.set(highlightName1, customHighlight1);
let element = iterator.next();
assert_false(element.done, 'The iteration continues when a new Highlight is added after starting the iteration');
assert_equals(element.value[0], highlightName1, 'The highlight name added after starting the iteration is found during the current iteration, following Map semantics');
assert_equals(element.value[1], customHighlight1, 'The Highlight added after starting the iteration is found during the current iteration, following Map semantics');
element = iterator.next();
assert_true(element.done, 'The iteration ends after visiting the added Highlight');
assert_equals(element.value, undefined, '.next() returns undefined when the iteration ends');
}, 'HighlightRegistry iteration includes Highlights added after starting the iteration (Map-like behavior)');
CSS.highlights.clear();
test(() => {
CSS.highlights.set(highlightName1, customHighlight1);
let iterator = CSS.highlights[Symbol.iterator]();
CSS.highlights.set(highlightName2, customHighlight2);
let element = iterator.next();
assert_false(element.done, 'The iteration continues with the first Highlight');
assert_equals(element.value[0], highlightName1, 'The first highlight name is returned');
assert_equals(element.value[1], customHighlight1, 'The first Highlight is returned');
element = iterator.next();
assert_false(element.done, 'The iteration continues to the Highlight added after starting the iteration, following Map semantics');
assert_equals(element.value[0], highlightName2, 'The highlight name added after starting the iteration is visited');
assert_equals(element.value[1], customHighlight2, 'The Highlight added after starting the iteration is visited');
element = iterator.next();
assert_true(element.done, 'The iteration ends after visiting both Highlights');
assert_equals(element.value, undefined, '.next() returns undefined when the iteration ends');
}, 'HighlightRegistry iteration includes Highlights added after starting the iteration when there were already Highlights (Map-like behavior)');
CSS.highlights.clear();
// Test deletions using .delete
test(() => {
CSS.highlights.set(highlightName1, customHighlight1);
let iterator = CSS.highlights[Symbol.iterator]();
CSS.highlights.delete(highlightName1);
let element = iterator.next();
assert_true(element.done, 'The iteration ends when the only Highlight is deleted before visiting it, following Map semantics');
assert_equals(element.value, undefined, 'A Highlight deleted before being visited is not returned during iteration');
}, 'HighlightRegistry iteration skips Highlights deleted before being visited (Map-like behavior)');
CSS.highlights.clear();
test(() => {
CSS.highlights.set(highlightName1, customHighlight1);
CSS.highlights.set(highlightName2, customHighlight2);
let iterator = CSS.highlights[Symbol.iterator]();
CSS.highlights.delete(highlightName2);
let element = iterator.next();
assert_false(element.done, 'The iteration doesn\'t end although the Highlight following to the one that was pointed to by the iterator was deleted');
assert_equals(element.value[0], highlightName1, 'The highlight name that was pointed to by the iterator is returned as it should although the next Highlight was deleted immediately after starting the iteration');
assert_equals(element.value[1], customHighlight1, 'The Highlight that was pointed to by the iterator is returned as it should although the next Highlight was deleted immediately after starting the iteration');
element = iterator.next();
assert_true(element.done, 'The iteration ends after the first Highlight since the second Highlight was deleted before being visited, following Map semantics');
assert_equals(element.value, undefined, '.next() returns undefined when the iteration ends');
}, 'HighlightRegistry iteration skips Highlights deleted before being visited even when other Highlights remain (Map-like behavior)');
CSS.highlights.clear();
test(() => {
CSS.highlights.set(highlightName1, customHighlight1);
CSS.highlights.set(highlightName2, customHighlight2);
let iterator = CSS.highlights[Symbol.iterator]();
let element = iterator.next();
assert_false(element.done, 'The iteration doesn\'t end when there are still two Highlights to visit');
assert_equals(element.value[0], highlightName1, 'The highlight name that was pointed to by the iterator is returned as it should');
assert_equals(element.value[1], customHighlight1, 'The Highlight that was pointed to by the iterator is returned as it should');
CSS.highlights.delete(highlightName1);
element = iterator.next();
assert_false(element.done, 'The iteration doesn\'t end when the Highlight previously visited is deleted and there is still a Highlight to visit');
assert_equals(element.value[0], highlightName2, 'The highlight name that was pointed to by the iterator is returned as it should although the previous Highlight was deleted after calling .next');
assert_equals(element.value[1], customHighlight2, 'The Highlight that was pointed to by the iterator is returned as it should although the previous Highlight was deleted after calling .next');
element = iterator.next();
assert_true(element.done, 'The iteration ends after going through all the highlights although the first Highlight was deleted after the first call to .next');
assert_equals(element.value, undefined, '.next() returns undefined when the iteration ends');
}, 'HighlightRegistry iteration is not modified when a Highlight that was already visited is deleted and there are still Highlights to visit');
CSS.highlights.clear();
// Test deletions using .clear
test(() => {
CSS.highlights.set(highlightName1, customHighlight1);
let iterator = CSS.highlights[Symbol.iterator]();
CSS.highlights.clear();
let element = iterator.next();
assert_true(element.done, 'The iteration ends when all Highlights are cleared before visiting them, following Map semantics');
assert_equals(element.value, undefined, '.clear() removes all Highlights before iteration visits them');
}, 'HighlightRegistry iteration skips all Highlights when .clear() is called before visiting them (Map-like behavior)');
</script>