scrollIntoView-vertical-rl-writing-mode.html (3767B)
1 <!DOCTYPE html> 2 <title>CSSOM View - scrollIntoView considers vertical-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="Suneel Kota" href="mailto:suneel.kota@samsung.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: vertical-rl; 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 vertical-rl mode, X corresponds to the block axis and is oriented 58 // leftward. Y corresponds to the inline axis and is oriented downward. 59 // So the beginning edges are the top and right edges and the ending 60 // edges are the bottom and left edges. 61 62 // This assumes that the horizontal scrollbar is on the bottom side. 63 64 var target = document.getElementById("target"); 65 var scroller = document.getElementById("scroller"); 66 var scrollbar_width = scroller.offsetWidth - scroller.clientWidth; 67 68 var scroller_width = scroller.offsetWidth; 69 var scroller_height = scroller.offsetHeight; 70 var box_width = target.offsetWidth; 71 var box_height = target.offsetHeight; 72 73 var expectedX; 74 // If scroll bar is on the left side, scroller.scrollLeft won't get bigger than 0, 75 scroller.scrollLeft = scrollbar_width; 76 if (scroller.scrollLeft == 0) { 77 expectedX = { 78 blockStart: -box_width, 79 blockCenter: -(((3*box_width - scroller_width)/2) + (scrollbar_width/2)), 80 blockEnd: -(((2*box_width) - scroller_width) + scrollbar_width), 81 }; 82 } else { 83 expectedX = { 84 blockStart: -(box_width - scrollbar_width), 85 blockCenter: -(((3*box_width - scroller_width)/2) + (scrollbar_width/2) - scrollbar_width), 86 blockEnd: -((2*box_width) - scroller_width), 87 }; 88 } 89 90 var expectedY = { 91 inlineStart: box_height, 92 inlineCenter: ((3*box_height - scroller_height)/2) + (scrollbar_width/2), 93 inlineEnd: ((2*box_height) - scroller_height) + scrollbar_width, 94 }; 95 96 [ 97 [{block: "start", inline: "start"}, expectedX.blockStart, expectedY.inlineStart], 98 [{block: "start", inline: "center"}, expectedX.blockStart, expectedY.inlineCenter], 99 [{block: "start", inline: "end"}, expectedX.blockStart, expectedY.inlineEnd], 100 [{block: "center", inline: "start"}, expectedX.blockCenter, expectedY.inlineStart], 101 [{block: "center", inline: "center"}, expectedX.blockCenter, expectedY.inlineCenter], 102 [{block: "center", inline: "end"}, expectedX.blockCenter, expectedY.inlineEnd], 103 [{block: "end", inline: "start"}, expectedX.blockEnd, expectedY.inlineStart], 104 [{block: "end", inline: "center"}, expectedX.blockEnd, expectedY.inlineCenter], 105 [{block: "end", inline: "end"}, expectedX.blockEnd, expectedY.inlineEnd], 106 ].forEach(([input, expectedX, expectedY]) => { 107 test(() => { 108 scroller.scrollTo(0, 0); 109 target.scrollIntoView(input); 110 assert_approx_equals(scroller.scrollLeft, expectedX, 0.5, "scrollX"); 111 assert_approx_equals(scroller.scrollTop, expectedY, 0.5, "scrollY"); 112 }, `scrollIntoView(${JSON.stringify(input)})`); 113 }) 114 115 </script> 116 117 </body> 118 </html>