| <!DOCTYPE html> |
| <title>CSSOM View - scrollIntoView considers scroll-margin</title> |
| <meta charset="utf-8"> |
| <link rel="author" title="Sandra Sun" href="mailto:sunyunjia@chromium.org"> |
| <link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollintoview"> |
| <link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-margin"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| |
| <style> |
| #scroller { |
| width: 200px; |
| height: 200px; |
| overflow: scroll; |
| } |
| #content { |
| width: 500px; |
| height: 500px; |
| } |
| #target { |
| position: relative; |
| left: 200px; |
| top: 200px; |
| width: 100px; |
| height: 100px; |
| scroll-margin-top: 4px; |
| scroll-margin-right: 8px; |
| scroll-margin-bottom: 12px; |
| scroll-margin-left: 16px; |
| background-color: lightgreen; |
| } |
| </style> |
| |
| <div id="scroller"> |
| <div id="content"> |
| <div id="target"></div> |
| </div> |
| </div> |
| <div id="log"></div> |
| |
| <script> |
| var target = document.getElementById("target"); |
| var scroller = document.getElementById("scroller"); |
| |
| var expectedXLeft = 200 - 16; |
| var expectedXRight = 200 - scroller.clientWidth + target.clientWidth + 8; |
| var expectedXCenter = 200 - (scroller.clientWidth / 2) + |
| (target.clientWidth + 8 - 16) / 2; |
| |
| var expectedYTop = 200 - 4; |
| var expectedYBottom = 200 - scroller.clientHeight + target.clientHeight + 12; |
| var expectedYCenter = 200 - (scroller.clientHeight / 2) + |
| (target.clientHeight + 12 - 4) / 2; |
| |
| // 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(", ")}}`; |
| } |
| |
| [ |
| [{block: "center", inline: "center"}, expectedXCenter, expectedYCenter], |
| [{block: "start", inline: "start"}, expectedXLeft, expectedYTop], |
| [{block: "end", inline: "end"}, expectedXRight, expectedYBottom], |
| ].forEach(([input, expectedX, expectedY]) => { |
| test(() => { |
| scroller.scrollTo(0, 0); |
| target.scrollIntoView(input); |
| assert_approx_equals(scroller.scrollLeft, expectedX, 0.5, "scrollX"); |
| assert_approx_equals(scroller.scrollTop, expectedY, 0.5, "scrollY"); |
| }, `scrollIntoView(${format_dict(input)})`); |
| }) |
| </script> |
