| <!doctype html> |
| <title>CSSOM View - scrollIntoView aligns scrollport-covering child in both inline and block directions.</title> |
| <meta charset="utf-8"> |
| <link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollintoview"> |
| <link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1497677"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| #scroller { |
| width: 200px; |
| height: 200px; |
| background-color: purple; |
| overflow: hidden; |
| position: relative; |
| } |
| #child { |
| width: 400px; |
| height: 400px; |
| background-color: green; |
| position: absolute; |
| left: 0px; |
| top: 0px; |
| } |
| </style> |
| <div id="scroller"> |
| <div id="space" style="height:400%; width: 400%"></div> |
| <div id="child"></div> |
| </div> |
| <script> |
| const scroller = document.getElementById("scroller"); |
| const child = document.getElementById("child"); |
| |
| function test_alignment(alignment, start_offset, expected_offset) { |
| scroller.scrollTop = start_offset.top; |
| scroller.scrollLeft = start_offset.left; |
| |
| child.scrollIntoView({block: alignment, inline: alignment}); |
| |
| assert_equals(scroller.scrollTop, expected_offset.top, |
| `${alignment} sets top`); |
| assert_equals(scroller.scrollLeft, expected_offset.left, |
| `${alignment} sets left`); |
| } |
| |
| test(function() { |
| // child, being positioned at (0, 0) and having size 400 x 400 covers the |
| // scrollport at scroll offsets (0,0) and (100, 100). |
| test_alignment("start", {top: 100, left: 100}, {top: 0, left: 0}); |
| test_alignment("center", {top: 0, left: 0}, {top: 100, left: 100}); |
| test_alignment("end", {top: 100, left: 100}, {top: 200, left: 200}); |
| }, "scrollIntoView scrolls scrollport-covering child in both axes"); |
| </script> |