98 lines
3.4 KiB
HTML
98 lines
3.4 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<style>
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#container {
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position: absolute;
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width: 400px;
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height: 400px;
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top: 0;
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left: 0;
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scroll-snap-type: y mandatory;
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overflow-x: hidden;
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overflow-y: scroll;
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border: 1px black dashed;
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opacity: 0.75;
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background-color: #EEE;
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}
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.child {
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width: 400px;
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height: 400px;
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scroll-snap-align: start;
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position: absolute;
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left: 0;
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}
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</style>
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<script>
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let write = s => output.innerHTML += s + "<br>";
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if (window.testRunner) {
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testRunner.dumpAsText();
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testRunner.waitUntilDone();
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}
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function deflateScrollSnapMargins(amount) {
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for (let child of document.querySelectorAll(".child")) {
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let currentMargin = parseInt(child.style.scrollSnapMargin.replace(/px/, ""));
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child.style.scrollSnapMargin = `${currentMargin - amount}px`;
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}
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}
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function zeroDelayTimeout(action) {
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return new Promise((resolve) => {
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setTimeout(() => {
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action();
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resolve();
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});
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});
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}
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function run()
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{
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if (!window.testRunner || !window.internals) {
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write(`To manually test, verify that scrolling snaps somewhere above each colored box. As you scroll further
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down, the distance between the snapped position and the top of the colored box should increase.`);
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return;
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}
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zeroDelayTimeout(() => {
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write("Scroll-snap offsets are: " + internals.scrollSnapOffsets(container));
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container.scrollTop += 100;
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container.style.width = "500px";
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})
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.then(() => {
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zeroDelayTimeout(() => {
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write("After resizing, the offsets should not have changed: " + internals.scrollSnapOffsets(container));
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container.scrollTop += 100;
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deflateScrollSnapMargins(10);
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});
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})
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.then(() => {
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zeroDelayTimeout(() => {
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write("After deflating scroll-snap-margin by 10px, the offsets are: " + internals.scrollSnapOffsets(container));
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container.scrollTop += 100;
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container.style.width = "400px";
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});
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})
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.then(() => {
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zeroDelayTimeout(() => {
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write("After resizing, the offsets should not have changed: " + internals.scrollSnapOffsets(container));
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testRunner.notifyDone();
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});
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});
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}
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</script>
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</head>
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<body onload=run()>
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<div id="container">
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<div class="child" style="background-color: red; top: 0px; scroll-snap-margin: 10px;"></div>
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<div class="child" style="background-color: green; top: 720px; scroll-snap-margin: 20px;"></div>
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<div class="child" style="background-color: blue; top: 1440px; scroll-snap-margin: 30px;"></div>
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<div class="child" style="background-color: aqua; top: 2160px; scroll-snap-margin: 40px;"></div>
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<div class="child" style="background-color: yellow; top: 2880px; scroll-snap-margin: 50px;"></div>
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<div class="child" style="background-color: fuchsia; top: 3600px; scroll-snap-margin: 60px;"></div>
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</div>
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<div id="output"></div>
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</body>
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</html>
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