93 lines
2.7 KiB
HTML
93 lines
2.7 KiB
HTML
<!DOCTYPE html>
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="./resources/intersection-observer-test-utils.js"></script>
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<style>
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pre, #log {
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position: absolute;
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top: 120px;
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left: 0;
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}
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#scroller {
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width: 250px;
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overflow: auto;
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}
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#overflow {
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width: 1000px;
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}
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.content {
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width: 100px;
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height: 20px;
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padding: 40px 0;
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text-align: center;
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background-color: grey;
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display: inline-block;
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}
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</style>
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<div id="scroller">
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<div id="overflow">
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<span><div class="content">1</div></span>
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<span><div class="content">2</div></span>
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<span><div class="content">3</div></span>
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<span id="target"><div class="content">4</div></span>
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<span><div class="content">5</div></span>
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</div>
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</div>
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<script>
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var vw = document.documentElement.clientWidth;
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var vh = document.documentElement.clientHeight;
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var entries = [];
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var scroller, target, spaceWidth, targetOffsetLeft, targetOffsetTop;
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runTestCycle(function() {
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scroller = document.getElementById("scroller");
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assert_true(!!scroller, "scroller exists");
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target = document.getElementById("target");
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assert_true(!!target, "target exists");
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var observer = new IntersectionObserver(function(changes) {
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entries = entries.concat(changes)
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});
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observer.observe(target);
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entries = entries.concat(observer.takeRecords());
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assert_equals(entries.length, 0, "No initial notifications.");
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runTestCycle(step0, "First rAF");
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}, "Inline target");
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function step0() {
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// Measure space width between two adjacent inlines.
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let nextEl = target.nextElementSibling;
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spaceWidth = nextEl.offsetLeft - target.offsetLeft - target.offsetWidth;
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// 8px body margin + 3 preceding siblings @ (100px width + spaceWidth) each
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targetOffsetLeft = 8 + 300 + (spaceWidth * 3);
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// 8px body margin + 40px top padding
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targetOffsetTop = 48;
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let left = targetOffsetLeft;
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let right = left + 100;
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let top = targetOffsetTop;
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let bottom = top + target.offsetHeight;
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scroller.scrollLeft = 90;
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runTestCycle(step1, "scroller.scrollLeft = 90");
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checkLastEntry(entries, 0, [left, right, top, bottom,
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0, 0, 0, 0, 0, vw, 0, vh, false]);
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}
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function step1() {
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// -90px for scroll offset
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let left = targetOffsetLeft - 90;
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let right = left + 100;
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let top = targetOffsetTop;
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let bottom = top + target.offsetHeight;
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// 8px body margin + 250px client width of scroller
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let scrollerRight = 258;
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checkLastEntry(entries, 1, [left, right, top, bottom,
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left, scrollerRight, top, bottom,
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0, vw, 0, vh, true]);
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}
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</script>
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