| <!DOCTYPE html> |
| <title>CSSOM View - scrollIntoView considers sideways-rl writing mode and rtl direction</title> |
| <meta charset="utf-8"> |
| <link rel="author" title="Cathie Chen" href="mailto:cathiechen@igalia.com"> |
| <link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollintoview"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| |
| <style> |
| .box { |
| float: left; |
| width: 200px; |
| height: 200px; |
| } |
| #scroller { |
| writing-mode: sideways-rl; |
| direction: rtl; |
| overflow: scroll; |
| width: 300px; |
| height: 300px; |
| } |
| #container{ |
| width: 600px; |
| height: 600px; |
| } |
| #target { |
| background-color: #ff0; |
| } |
| </style> |
| <body> |
| <div id="scroller"> |
| <div id="container"> |
| <!-- ROW-1 --> |
| <div class="row"> |
| <div class="box"></div> |
| <div class="box"></div> |
| <div class="box"></div> |
| </div> |
| |
| <!-- ROW-2 --> |
| <div class="row"> |
| <div class="box"></div> |
| <div class="box" id="target"></div> |
| <div class="box"></div> |
| </div> |
| |
| <!-- ROW-3 --> |
| <div class="row"> |
| <div class="box"></div> |
| <div class="box"></div> |
| <div class="box"></div> |
| </div> |
| </div> |
| </div> |
| |
| <script> |
| // In sideways-rl mode and rtl direction, X corresponds to the block axis and is oriented leftward. |
| // Y corresponds to the inline axis and is oriented upward. |
| // So the beginning edges are the bottom and right edges and the ending edges are the top and left edges. |
| |
| // According to the spec, x be min(0, max(x, element padding edge width - element scrolling area width)). |
| // So x is nonpositive and decreases leftward. |
| // According to the spec, y be min(0, max(y, element padding edge height - element scrolling area height)). |
| // So y is nonpositive and decreases upward. |
| |
| // This assumes that the horizontal scrollbar is on the bottom side and the vertical scrollbar is on the left side. |
| |
| var target = document.getElementById("target"); |
| var scroller = document.getElementById("scroller"); |
| var scrollbar_width = scroller.offsetWidth - scroller.clientWidth; |
| |
| var scroller_width = scroller.offsetWidth; |
| var scroller_height = scroller.offsetHeight; |
| var box_width = target.offsetWidth; |
| var box_height = target.offsetHeight; |
| |
| var expectedX = { |
| blockStart: -box_width, |
| blockCenter: -((3*box_width - scroller_width)/2) - scrollbar_width/2, |
| blockEnd: -(2*box_width - scroller_width) - scrollbar_width, |
| }; |
| |
| var expectedY = { |
| inlineStart: -box_height, |
| inlineCenter: -((3*box_height - scroller_height)/2) - scrollbar_width/2, |
| inlineEnd: -(2*box_height - scroller_height) - scrollbar_width, |
| }; |
| |
| [ |
| [{block: "start", inline: "start"}, expectedX.blockStart, expectedY.inlineStart], |
| [{block: "start", inline: "center"}, expectedX.blockStart, expectedY.inlineCenter], |
| [{block: "start", inline: "end"}, expectedX.blockStart, expectedY.inlineEnd], |
| [{block: "center", inline: "start"}, expectedX.blockCenter, expectedY.inlineStart], |
| [{block: "center", inline: "center"}, expectedX.blockCenter, expectedY.inlineCenter], |
| [{block: "center", inline: "end"}, expectedX.blockCenter, expectedY.inlineEnd], |
| [{block: "end", inline: "start"}, expectedX.blockEnd, expectedY.inlineStart], |
| [{block: "end", inline: "center"}, expectedX.blockEnd, expectedY.inlineCenter], |
| [{block: "end", inline: "end"}, expectedX.blockEnd, expectedY.inlineEnd], |
| ].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(${JSON.stringify(input)})`); |
| }) |
| |
| </script> |
| |
| </body> |
| </html> |
