| <!DOCTYPE html> |
| <title>Tests that overflowing the inset-modified containing block triggers position fallback</title> |
| <link rel="help" href="https://drafts.csswg.org/css-anchor-1/#fallback"> |
| <link rel="author" href="mailto:xiaochengh@chromium.org"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/resources/check-layout-th.js"></script> |
| <style> |
| .cb { |
| width: 400px; |
| height: 400px; |
| transform: scale(1); |
| background: yellow; |
| } |
| .anchor1 { |
| anchor-name: --a; |
| margin-left: 100px; |
| width: 100px; |
| height: 100px; |
| background: blue; |
| } |
| .target { |
| position: absolute; |
| position-fallback: --fallback; |
| width: min-content; |
| height: 100px; |
| background: orange; |
| } |
| .inline-spacer { |
| display: inline-block; |
| width: 200px; |
| height: 100px; |
| } |
| @position-fallback --fallback { |
| @try { /* 1: Position to the left of the anchor. */ |
| left: 0; |
| right: anchor(--a left); |
| top: anchor(--a top); |
| } |
| @try { /* 2: Position to the right of the anchor. */ |
| left: anchor(--a right); |
| right: 0; |
| top: anchor(--a top); |
| } |
| @try { /* 3: Placeholder fallback that shouldn't be selected when the previous |
| ones do not overflow the available space. */ |
| inset: 0; |
| } |
| } |
| </style> |
| <body onload="checkLayout('.target')"> |
| <!-- The first `@try` overflows the inset-modifed containing block --> |
| <div class="cb"> |
| <div class="anchor1"></div> |
| <div class="target" |
| data-offset-x=200 data-offset-y=0 |
| data-expected-width=200 data-expected-height=100> |
| <span class="inline-spacer"></span> |
| </div> |
| </div> |
| </body> |
