136 lines
3.4 KiB
HTML
136 lines
3.4 KiB
HTML
<!DOCTYPE html>
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<html class="reftest-wait">
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<meta charset="utf-8">
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<title>Snapped rendering of scrolled contents</title>
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<style>
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body {
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margin: 0;
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padding: 60px;
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}
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#scrollArea {
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width: 360px;
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overflow: auto;
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scrollbar-width: none;
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background: red;
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outline: 1px solid black;
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}
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#scrolledContent {
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position: relative;
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background: white;
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}
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#line {
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height: 1px;
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background-color: black;
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margin-bottom: -1px;
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}
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#boxWrapper {
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display: flex;
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flex-flow: row nowrap;
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justify-content: space-around;
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}
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#boxWrapper > div {
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width: 60px;
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height: 60px;
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box-sizing: border-box;
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}
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#box1 {
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margin-top: -0.3px;
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border: 1px solid red;
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}
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#box2 {
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border: 1px solid green;
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}
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#box3 {
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margin-top: 0.3px;
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border: 1px solid blue;
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}
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#scrollIntoViewTarget {
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position: absolute;
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left: 0;
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width: 0;
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}
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</style>
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<div id="scrollArea">
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<div id="scrolledContent">
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<div id="topSpacer"></div>
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<div id="line"></div>
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<div id="boxWrapper">
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<div id="box1"></div>
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<div id="box2"></div>
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<div id="box3"></div>
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</div>
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<div id="scrollIntoViewTarget"></div>
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</div>
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</div>
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<script>
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function getFloatQueryParams(defaultValues) {
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const result = Object.assign({}, defaultValues);
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const searchParams = new URLSearchParams(location.search);
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for (const [key, value] of searchParams) {
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result[key] = parseFloat(value);
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}
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return result;
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}
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const params = getFloatQueryParams({
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top: 0,
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topSpace: 96,
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outerBottom: 192,
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innerBottom: 240,
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scrollIntoViewPos: null,
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scrollTop: null,
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});
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const scrollArea = document.getElementById("scrollArea");
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const scrolledContent = document.getElementById("scrolledContent");
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const topSpacer = document.getElementById("topSpacer");
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scrollArea.style.marginTop = params.top + "px";
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topSpacer.style.height = (params.topSpace - params.top) + "px";
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scrollArea.style.height = (params.outerBottom - params.top) + "px";
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scrolledContent.style.height = (params.innerBottom - params.top) + "px";
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// Make sure the scroll frame has a display port.
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scrollArea.scrollTop = 1;
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scrollArea.scrollTop = 2;
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scrollArea.scrollTop = 0;
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function performScroll() {
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if (params.scrollIntoViewPos !== null) {
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// Scroll using `scrollIntoView`.
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// At the time this test was written (2024-09-05), this way of calling scrollIntoView
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// causes a ScrollTo call which doesn't allow any adjustment of the target scroll
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// position for pixel alignment. This exercises "unsnapped" scrolling even if
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// layout.scroll.disable-pixel-alignment is false. It also lets you scroll to
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// fractional CSS positions, unlike scrollTop or scrollTo().
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const scrollIntoViewTarget = document.getElementById("scrollIntoViewTarget");
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scrollIntoViewTarget.style.top = params.scrollIntoViewPos + "px";
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scrollIntoViewTarget.style.height = (params.outerBottom - params.top) + "px";
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scrollIntoViewTarget.scrollIntoView();
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} else if (params.scrollTop !== null) {
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// Scroll to params.scrollTop using the scrollTop property.
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// At the time this test was written (2024-09-05), this property only accepts integers in IceCat.
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scrollArea.scrollTop = params.scrollTop;
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}
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document.documentElement.removeAttribute('class');
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}
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document.addEventListener("MozReftestInvalidate", performScroll);
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</script>
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