| <!DOCTYPE html> |
| <title>CSSOM View - scrollIntoView considers direction:rtl</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"> |
| <link rel="help" href="https://drafts.csswg.org/cssom-view/#scroll-an-element"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| |
| <style> |
| .box { |
| float: left; |
| width: 200px; |
| height: 200px; |
| } |
| #scroller { |
| direction: rtl; |
| overflow-x: scroll; |
| width: 300px; |
| height: 215px; |
| } |
| #container{ |
| width: 600px; |
| height: 200px; |
| } |
| #target { |
| background-color: #ff0; |
| } |
| </style> |
| <body> |
| <div id="scroller"> |
| <div id="container"> |
| <div class="row"> |
| <div class="box"></div> |
| <div class="box" id="target"></div> |
| <div class="box"></div> |
| </div> |
| </div> |
| </div> |
| |
| <script> |
| // This page is direction: rtl and scroller is direction: rtl. |
| // So the the overflow direction is leftward, downward. The beginning edges are the top and right edges. |
| // And the ending edges are the bottom and left edges. |
| // Acording to the spec, x is min(0, max(x, element padding edge width - element scrolling area width)). |
| // So x is nonpositive and decreases leftward. |
| |
| var target = document.getElementById("target"); |
| var scroller = document.getElementById("scroller"); |
| var box_width = target.offsetWidth; |
| var scroller_width = scroller.offsetWidth; |
| |
| var leftEdge = -2*box_width + scroller_width; |
| var center = -(3*box_width - scroller_width)/2; |
| var rightEdge = - box_width; |
| |
| test(() => { |
| scroller.scrollTo(0, 0); |
| target.scrollIntoView({inline: "start"}); |
| assert_approx_equals(scroller.scrollLeft, rightEdge, 0.5, "start should be the right edge"); |
| }, `scrollIntoView({inline: "start"}), direction: rtl`); |
| |
| test(() => { |
| scroller.scrollTo(0, 0); |
| target.scrollIntoView({inline: "center"}); |
| assert_approx_equals(scroller.scrollLeft, center, 0.5, "should center the target"); |
| }, `scrollIntoView({inline: "center"}), direction: rtl`); |
| |
| test(() => { |
| scroller.scrollTo(0, 0); |
| target.scrollIntoView({inline: "end"}); |
| assert_approx_equals(scroller.scrollLeft, leftEdge, 0.5, "end should be the left edge"); |
| }, `scrollIntoView({inline: "end"}), direction: rtl`); |
| </script> |
| |
| </body> |
| </html> |
