| <!DOCTYPE html> |
| <html> |
| |
| <head> |
| <meta charset="utf-8"> |
| <title>CSS Test: scroll tracking for ::scroll-markers whose orignatin elements cannot be scroll-aligned </title> |
| <link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-container-scroll"> |
| </head> |
| |
| <body> |
| <style> |
| .wrapper { |
| display: grid; |
| justify-content: center; |
| } |
| |
| .carousel { |
| width: 800px; |
| height: 200px; |
| overflow-x: scroll; |
| scroll-snap-type: x mandatory; |
| list-style-type: none; |
| scroll-behavior: smooth; |
| border: solid 2px grey; |
| padding-top: 10%; |
| text-align: center; |
| counter-set: markeridx -1; |
| columns: 2; |
| |
| /* All odd-numbered children generate scroll-markers. For the test, we |
| need 2 more cxhildren to generate scroll-markers. This uses children 2 |
| and 4.*/ |
| & > :nth-child(odd)::scroll-marker, |
| & > :nth-child(2)::scroll-marker, |
| & > :nth-child(4)::scroll-marker { |
| counter-increment: markeridx; |
| align-content: center; |
| text-align: center; |
| width: 35px; |
| height: 35px; |
| border-radius: 50%; |
| margin: 3px; |
| background-color: red; |
| } |
| |
| /* This lines up the scroll-markers' numbers to match the way Chromium |
| lays out the scroll-markers which seems to be all |
| element::scroll-markers first/leftmost and then, |
| ::column-scroll-markers, despite the ::column::scroll-markers being |
| numbered first. The numbers are not important for the test's |
| functionality. They only help investigating the browser's behavior.*/ |
| & > :nth-child(1)::scroll-marker { content: "8"; } |
| & > :nth-child(3)::scroll-marker { content: "0"; } |
| & > :nth-child(2)::scroll-marker { content: "9"; } |
| & > :nth-child(4)::scroll-marker { content: "1"; } |
| & > :nth-child(5)::scroll-marker { content: "2"; } |
| & > :nth-child(7)::scroll-marker { content: "3"; } |
| & > :nth-child(9)::scroll-marker { content: "4"; } |
| & > :nth-child(11)::scroll-marker { content: "5"; } |
| & > :nth-child(13)::scroll-marker { content: "6"; } |
| /* In the test, item 14 (child 15) is the scrollIntoView target. |
| Its column (the right-most column) should be selected and corresponds to |
| the column. */ |
| & > :nth-child(15)::scroll-marker { |
| content: "7"; |
| background-color: green; |
| } |
| |
| &>.item { |
| scroll-snap-align: none; |
| height: 80%; |
| width: 158px; |
| border: 1px solid; |
| place-content: center; |
| display: inline-block; |
| } |
| |
| /* Make only item 16 (index 15) a snap target so we are scrolled all the |
| way to the right edge */ |
| & > :nth-child(14){ |
| scroll-snap-align: center; |
| } |
| |
| scroll-marker-group: after; |
| |
| &::scroll-marker-group { |
| height: 45px; |
| display: flex; |
| align-items: center; |
| justify-content: center; |
| border: solid 1px black; |
| border-radius: 30px; |
| } |
| } |
| </style> |
| <div class="wrapper" id="wrapper"> |
| <div class="carousel" id="carousel"> |
| <div class="item item0" tabindex=0>0</div> |
| <div class="item item1" tabindex=0>1</div> |
| <div class="item item2" tabindex=0>2</div> |
| <div class="item item3" tabindex=0>3</div> |
| <div class="item item4" tabindex=0>4</div> |
| <div class="item item5" tabindex=0>5</div> |
| <div class="item item6" tabindex=0>6</div> |
| <div class="item item7" tabindex=0>7</div> |
| <div class="item item8" tabindex=0>8</div> |
| <div class="item item9" tabindex=0>9</div> |
| <div class="item item10" tabindex=0>10</div> |
| <div class="item item11" tabindex=0>11</div> |
| <div class="item item12" tabindex=0>12</div> |
| <div class="item item13" tabindex=0>13</div> |
| <div class="item item14" tabindex=0>14</div> |
| <div class="item item15" tabindex=0>15</div> |
| </div> |
| <div id="buttons" style></div> |
| </div> |
| </body> |
| |
| </html> |
