| <!doctype html> |
| <meta charset="utf-8"> |
| <title>CSS Overflow: scrollbar-gutter on the root, scrolling</title> |
| <link rel="author" title="Felipe Erias Morandeira" href="mailto:felipeerias@igalia.com" /> |
| <link rel="help" href="https://drafts.csswg.org/css-overflow-4/#scrollbar-gutter-property" /> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/css/support/parsing-testcommon.js"></script> |
| <style> |
| body, |
| html { |
| margin: 0; |
| padding: 0; |
| border: none; |
| } |
| |
| :root { |
| scrollbar-gutter: stable; |
| } |
| |
| #content { |
| background: green; |
| width: 100%; |
| /* force scrolling */ |
| height: 200vh; |
| } |
| </style> |
| |
| <body> |
| |
| <div id="content"></div> |
| |
| <script type="text/javascript"> |
| setup({ explicit_done: true }); |
| |
| test(function () { |
| let root = document.documentElement; |
| let body = document.body; |
| let content = document.getElementById('content'); |
| |
| // Note: as per the spec, the clientWidth of the root element is |
| // "viewport width excluding the size of a rendered scroll bar (if any)" |
| // which does not take scrollbar-gutter into account. |
| // Since no such special case exists for offsetWidth, this means that here |
| // root.clientWidth is greater than root.offsetWidth (!!!). |
| |
| assert_less_than(root.offsetWidth, window.innerWidth, "viewport has gutter"); |
| assert_equals(body.offsetWidth, root.offsetWidth, "body matches root"); |
| assert_equals(body.clientWidth, body.offsetWidth, "body has no gutter"); |
| assert_equals(content.offsetWidth, body.clientWidth, "content matches body"); |
| }, "viewport has gutter, others do not"); |
| |
| done(); |
| |
| </script> |
| </body> |