85 lines
2.1 KiB
HTML
85 lines
2.1 KiB
HTML
<!DOCTYPE html>
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<html>
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<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
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<body>
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<style>
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:root {
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margin: 0px;
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}
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#spacer {
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height: 100vh;
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width: 100px;
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}
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#top_box {
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width: 100px;
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height: 60vh;
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background-color: blue;
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}
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#middle_box {
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width: 100px;
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height: 60vh;
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scroll-initial-target: nearest;
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background-color: purple;
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}
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#bottom_box {
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width: 100px;
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height: 60vh;
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background-color: yellow;
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}
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#fragment_target {
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width: 100px;
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height: 100px;
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background-color: red;
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}
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</style>
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<div id="top_box"></div>
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<div id="middle_box"></div>
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<div id="bottom_box"></div>
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<div id="spacer"></div>
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<div id="fragment_target">Target</div>
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<script>
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function stashResult(key, results) {
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fetch(`/css/css-scroll-snap/scroll-initial-target/stash.py?key=${key}`, {
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method: "POST",
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body: JSON.stringify(results)
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}).then(() => {
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window.close();
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});
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}
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function record() {
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let scroll_position = "UNKNOWN";
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// Expect page is scrolled all the way down as the text is at the bottom of
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// the page.
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const expected_scroll_top = document.scrollingElement.scrollHeight -
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document.scrollingElement.clientHeight;
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const scroll_start_target_top = Math.round(top_box.getBoundingClientRect().height);
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const actual_scroll_top = Math.round(document.scrollingElement.scrollTop);
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if (actual_scroll_top == scroll_start_target_top) {
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scroll_position = "AT_SCROLL_START_TARGET";
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} else if (actual_scroll_top == expected_scroll_top) {
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scroll_position = "AT_TEXT_FRAGMENT";
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}
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const result = {
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scroll_position: scroll_position
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};
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let key = (new URL(document.location)).searchParams.get("key");
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stashResult(key, result);
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}
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window.onload = () => {
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window.requestAnimationFrame(function () {
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window.requestAnimationFrame(record);
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})
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}
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</script>
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</body>
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</html>
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