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77 lines
No EOL
2.3 KiB
HTML
77 lines
No EOL
2.3 KiB
HTML
<!DOCTYPE html>
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<title>CSSOM View - scrollIntoView considers scroll-padding</title>
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<meta charset="utf-8">
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<link rel="author" title="Sandra Sun" href="mailto:sunyunjia@chromium.org">
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<link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollintoview">
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<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-padding">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<style>
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#scroller {
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width: 200px;
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height: 200px;
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overflow: scroll;
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scroll-padding-top: 4px;
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scroll-padding-right: 8px;
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scroll-padding-bottom: 12px;
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scroll-padding-left: 16px;
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}
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#content {
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width: 500px;
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height: 500px;
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}
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#target {
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position: relative;
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left: 200px;
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top: 200px;
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width: 100px;
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height: 100px;
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background-color: lightgreen;
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}
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</style>
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<div id="scroller">
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<div id="content">
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<div id="target"></div>
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</div>
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</div>
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<div id="log"></div>
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<script>
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var target = document.getElementById("target");
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var scroller = document.getElementById("scroller");
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var expectedXLeft = 200 - 16;
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var expectedXRight = 200 - scroller.clientWidth + 8 + target.clientWidth;
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var expectedXCenter = 200 - (16 + scroller.clientWidth - 8) / 2 +
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target.clientWidth / 2;
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var expectedYTop = 200 - 4;
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var expectedYBottom = 200 - scroller.clientHeight + 12 + target.clientHeight;
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var expectedYCenter = 200 - (4 + scroller.clientHeight - 12) / 2 +
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target.clientHeight / 2;
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// This formats dict as a string suitable as test name.
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// format_value() is provided by testharness.js,
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// which also preserves sign for -0.
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function format_dict(dict) {
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const props = [];
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for (let prop in dict) {
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props.push(`${prop}: ${format_value(dict[prop])}`);
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}
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return `{${props.join(", ")}}`;
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}
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[
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[{block: "center", inline: "center"}, expectedXCenter, expectedYCenter],
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[{block: "start", inline: "start"}, expectedXLeft, expectedYTop],
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[{block: "end", inline: "end"}, expectedXRight, expectedYBottom],
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].forEach(([input, expectedX, expectedY]) => {
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test(() => {
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scroller.scrollTo(0, 0);
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target.scrollIntoView(input);
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assert_approx_equals(scroller.scrollLeft, expectedX, 0.5, "scrollX");
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assert_approx_equals(scroller.scrollTop, expectedY, 0.5, "scrollY");
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}, `scrollIntoView(${format_dict(input)})`);
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})
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</script> |