scrollIntoView-sideways-lr-writing-mode.html (3553B)
1 <!DOCTYPE html> 2 <title>CSSOM View - scrollIntoView considers sideways-rl writing mode</title> 3 <meta charset="utf-8"> 4 <meta name="viewport" content="width=device-width,initial-scale=1"> 5 <link rel="author" title="Cathie Chen" href="mailto:cathiechen@igalia.com"> 6 <link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollintoview"> 7 <script src="/resources/testharness.js"></script> 8 <script src="/resources/testharnessreport.js"></script> 9 10 <style> 11 .box { 12 float: left; 13 width: 200px; 14 height: 200px; 15 } 16 #scroller { 17 writing-mode: sideways-lr; 18 overflow: scroll; 19 width: 300px; 20 height: 300px; 21 } 22 #container{ 23 width: 600px; 24 height: 600px; 25 } 26 #target { 27 background-color: #ff0; 28 } 29 </style> 30 <body> 31 <div id="scroller"> 32 <div id="container"> 33 <!-- ROW-1 --> 34 <div class="row"> 35 <div class="box"></div> 36 <div class="box"></div> 37 <div class="box"></div> 38 </div> 39 40 <!-- ROW-2 --> 41 <div class="row"> 42 <div class="box"></div> 43 <div class="box" id="target"></div> 44 <div class="box"></div> 45 </div> 46 47 <!-- ROW-3 --> 48 <div class="row"> 49 <div class="box"></div> 50 <div class="box"></div> 51 <div class="box"></div> 52 </div> 53 </div> 54 </div> 55 56 <script> 57 // In sideways-lr mode, X corresponds to the block axis and is oriented rightward. 58 // Y corresponds to the inline axis and is oriented upward. 59 // So the beginning edges are the bottom and left edges and the ending edges are the top and right edges. 60 61 // According to the spec, y be min(0, max(y, element padding edge height - element scrolling area height)). 62 // So y is nonpositive and decreases upward. 63 64 // This assumes that the horizontal scrollbar is on the bottom side and the vertical scrollbar is on the right side. 65 66 var target = document.getElementById("target"); 67 var scroller = document.getElementById("scroller"); 68 var scrollbar_width = scroller.offsetWidth - scroller.clientWidth; 69 70 var scroller_width = scroller.offsetWidth; 71 var scroller_height = scroller.offsetHeight; 72 var box_width = target.offsetWidth; 73 var box_height = target.offsetHeight; 74 75 var expectedX = { 76 blockStart: box_width, 77 blockCenter: (3*box_width - scroller_width)/2 + scrollbar_width/2, 78 blockEnd: 2*box_width - scroller_width + scrollbar_width, 79 }; 80 81 var expectedY = { 82 inlineStart: -box_height, 83 inlineCenter: -((3*box_height - scroller_height)/2) - scrollbar_width/2, 84 inlineEnd: -(2*box_height - scroller_height) - scrollbar_width, 85 }; 86 87 [ 88 [{block: "start", inline: "start"}, expectedX.blockStart, expectedY.inlineStart], 89 [{block: "start", inline: "center"}, expectedX.blockStart, expectedY.inlineCenter], 90 [{block: "start", inline: "end"}, expectedX.blockStart, expectedY.inlineEnd], 91 [{block: "center", inline: "start"}, expectedX.blockCenter, expectedY.inlineStart], 92 [{block: "center", inline: "center"}, expectedX.blockCenter, expectedY.inlineCenter], 93 [{block: "center", inline: "end"}, expectedX.blockCenter, expectedY.inlineEnd], 94 [{block: "end", inline: "start"}, expectedX.blockEnd, expectedY.inlineStart], 95 [{block: "end", inline: "center"}, expectedX.blockEnd, expectedY.inlineCenter], 96 [{block: "end", inline: "end"}, expectedX.blockEnd, expectedY.inlineEnd], 97 ].forEach(([input, expectedX, expectedY]) => { 98 test(() => { 99 scroller.scrollTo(0, 0); 100 target.scrollIntoView(input); 101 assert_approx_equals(scroller.scrollLeft, expectedX, 0.5, "scrollX"); 102 assert_approx_equals(scroller.scrollTop, expectedY, 0.5, "scrollY"); 103 }, `scrollIntoView(${JSON.stringify(input)})`); 104 }) 105 106 </script> 107 108 </body> 109 </html>