scrollIntoView-sideways-rl-writing-mode-and-rtl-direction.html (3765B)
1 <!DOCTYPE html> 2 <title>CSSOM View - scrollIntoView considers sideways-rl writing mode and rtl direction</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-rl; 18 direction: rtl; 19 overflow: scroll; 20 width: 300px; 21 height: 300px; 22 } 23 #container{ 24 width: 600px; 25 height: 600px; 26 } 27 #target { 28 background-color: #ff0; 29 } 30 </style> 31 <body> 32 <div id="scroller"> 33 <div id="container"> 34 <!-- ROW-1 --> 35 <div class="row"> 36 <div class="box"></div> 37 <div class="box"></div> 38 <div class="box"></div> 39 </div> 40 41 <!-- ROW-2 --> 42 <div class="row"> 43 <div class="box"></div> 44 <div class="box" id="target"></div> 45 <div class="box"></div> 46 </div> 47 48 <!-- ROW-3 --> 49 <div class="row"> 50 <div class="box"></div> 51 <div class="box"></div> 52 <div class="box"></div> 53 </div> 54 </div> 55 </div> 56 57 <script> 58 // In sideways-rl mode and rtl direction, X corresponds to the block axis and is oriented leftward. 59 // Y corresponds to the inline axis and is oriented upward. 60 // So the beginning edges are the bottom and right edges and the ending edges are the top and left edges. 61 62 // According to the spec, x be min(0, max(x, element padding edge width - element scrolling area width)). 63 // So x is nonpositive and decreases leftward. 64 // According to the spec, y be min(0, max(y, element padding edge height - element scrolling area height)). 65 // So y is nonpositive and decreases upward. 66 67 // This assumes that the horizontal scrollbar is on the bottom side and the vertical scrollbar is on the left side. 68 69 var target = document.getElementById("target"); 70 var scroller = document.getElementById("scroller"); 71 var scrollbar_width = scroller.offsetWidth - scroller.clientWidth; 72 73 var scroller_width = scroller.offsetWidth; 74 var scroller_height = scroller.offsetHeight; 75 var box_width = target.offsetWidth; 76 var box_height = target.offsetHeight; 77 78 var expectedX = { 79 blockStart: -box_width, 80 blockCenter: -((3*box_width - scroller_width)/2) - scrollbar_width/2, 81 blockEnd: -(2*box_width - scroller_width) - scrollbar_width, 82 }; 83 84 var expectedY = { 85 inlineStart: -box_height, 86 inlineCenter: -((3*box_height - scroller_height)/2) - scrollbar_width/2, 87 inlineEnd: -(2*box_height - scroller_height) - scrollbar_width, 88 }; 89 90 [ 91 [{block: "start", inline: "start"}, expectedX.blockStart, expectedY.inlineStart], 92 [{block: "start", inline: "center"}, expectedX.blockStart, expectedY.inlineCenter], 93 [{block: "start", inline: "end"}, expectedX.blockStart, expectedY.inlineEnd], 94 [{block: "center", inline: "start"}, expectedX.blockCenter, expectedY.inlineStart], 95 [{block: "center", inline: "center"}, expectedX.blockCenter, expectedY.inlineCenter], 96 [{block: "center", inline: "end"}, expectedX.blockCenter, expectedY.inlineEnd], 97 [{block: "end", inline: "start"}, expectedX.blockEnd, expectedY.inlineStart], 98 [{block: "end", inline: "center"}, expectedX.blockEnd, expectedY.inlineCenter], 99 [{block: "end", inline: "end"}, expectedX.blockEnd, expectedY.inlineEnd], 100 ].forEach(([input, expectedX, expectedY]) => { 101 test(() => { 102 scroller.scrollTo(0, 0); 103 target.scrollIntoView(input); 104 assert_approx_equals(scroller.scrollLeft, expectedX, 0.5, "scrollX"); 105 assert_approx_equals(scroller.scrollTop, expectedY, 0.5, "scrollY"); 106 }, `scrollIntoView(${JSON.stringify(input)})`); 107 }) 108 109 </script> 110 111 </body> 112 </html>