<!DOCTYPE html> <title>CSSOM View - scrollIntoView</title> <meta charset="utf-8"> <meta name="viewport" content="initial-scale=1"> <link rel="author" title="Chris Wu" href="mailto:pwx.frontend@gmail.com"> <link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollintoview"> <link rel="help" href="https://webidl.spec.whatwg.org/#es-operations"> <link rel="help" href="https://webidl.spec.whatwg.org/#es-overloads"> <meta name="flags" content="dom"> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <style> body.running { margin: 0; padding: 4000px; overflow: hidden } body.running #testDiv { width: 200px; height: 200px; background-color: lightgreen; } </style> <body class=running> <div id=testDiv></div> <div id="log"></div> <script> var testDiv = document.getElementById('testDiv'); var expectedXLeft = 4000; var expectedXRight = 4000 - window.innerWidth + testDiv.clientWidth; var expectedXCenter = 4000 - (window.innerWidth / 2) + (testDiv.clientWidth / 2); var expectedYTop = 4000; var expectedYBottom = 4000 - window.innerHeight + testDiv.clientHeight; var expectedYCenter = 4000 - (window.innerHeight / 2) + (testDiv.clientHeight / 2); [ ["omitted argument", "nearest", expectedYTop], [true, "nearest", expectedYTop], [false, "nearest", expectedYBottom], [undefined, "nearest", expectedYTop], [null, "nearest", expectedYTop], [{}, "nearest", expectedYTop], [{block: "center", inline: "center"}, expectedXCenter, expectedYCenter], [{block: "start", inline: "start"}, expectedXLeft, expectedYTop], [{block: "end", inline: "end"}, expectedXRight, expectedYBottom], [{block: "nearest", inline: "nearest"}, "nearest", "nearest"], ].forEach(([input, expectedX, expectedY]) => { test(() => { window.scrollTo(0, 0); testScrollIntoView(input); var x = (expectedX === "nearest") ? expectedXRight : expectedX; var y = (expectedY === "nearest") ? expectedYBottom : expectedY; assert_approx_equals(window.scrollX, x, 0.5, 'scrollX'); assert_approx_equals(window.scrollY, y, 0.5, 'scrollY'); }, `scrollIntoView(${format_input(input)}) starting at left,top`); test(() => { window.scrollTo(0, 12000); testScrollIntoView(input); var x = (expectedX === "nearest") ? expectedXRight : expectedX; var y = (expectedY === "nearest") ? expectedYTop : expectedY; assert_approx_equals(window.scrollX, x, 0.5, 'scrollX'); assert_approx_equals(window.scrollY, y, 0.5, 'scrollY'); }, `scrollIntoView(${format_input(input)}) starting at left,bottom`); test(() => { window.scrollTo(12000, 0); testScrollIntoView(input); var x = (expectedX === "nearest") ? expectedXLeft : expectedX; var y = (expectedY === "nearest") ? expectedYBottom : expectedY; assert_approx_equals(window.scrollX, x, 0.5, 'scrollX'); assert_approx_equals(window.scrollY, y, 0.5, 'scrollY'); }, `scrollIntoView(${format_input(input)}) starting at right,top`); test(() => { window.scrollTo(12000, 12000); testScrollIntoView(input); var x = (expectedX === "nearest") ? expectedXLeft : expectedX; var y = (expectedY === "nearest") ? expectedYTop : expectedY; assert_approx_equals(window.scrollX, x, 0.5, 'scrollX'); assert_approx_equals(window.scrollY, y, 0.5, 'scrollY'); }, `scrollIntoView(${format_input(input)}) starting at right,bottom`); }); function testScrollIntoView(input) { if (input === "omitted argument") { testDiv.scrollIntoView(); } else { testDiv.scrollIntoView(input); } } // This formats dict as a string suitable as test name. // format_value() is provided by testharness.js, // which also preserves sign for -0. function format_dict(dict) { const props = []; for (let prop in dict) { props.push(`${prop}: ${format_value(dict[prop])}`); } return `{${props.join(', ')}}`; } function format_input(input) { if (input === "omitted argument") { return ""; } else if (input === null || typeof input !== "object") { return format_value(input); } return format_dict(input); } document.body.classList.remove('running'); window.scrollTo(0, 0); </script>