<!doctype html> <meta charset="utf-8"> <title>CSS Scrollbars: scrollbar-width on scrollable areas correctly interacts with ::-webkit-scrollbar</title> <link rel="author" title="Luke Warlow" href="mailto:luke@warlow.dev" /> <link rel="help" href="https://drafts.csswg.org/css-scrollbars-1/" /> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="/css/support/parsing-testcommon.js"></script> <style> .container { overflow: auto; height: 200px; width: 200px; margin: 1px; padding: 0px; border: none; background: deepskyblue; } .content { height: 300px; width: 100%; background: lightsalmon; } .container.auto { scrollbar-width: auto; } /* This is so that browsers that don't implement the WebKit prefix still pass the test */ @supports not selector(::-webkit-scrollbar) { .container.auto { overflow: hidden; } } ::-webkit-scrollbar { display: none; } .container.thin { scrollbar-width: thin; } </style> <script> function performTest() { setup({ explicit_done: true }); // ltr test(function () { let container = document.getElementById('container_auto'); let content = document.getElementById('content_auto'); assert_equals(container.scrollWidth, 200, "auto scrollWidth"); assert_equals(container.clientWidth, 200, "auto clientWidth"); assert_equals(container.offsetLeft, content.offsetLeft, "auto offsetLeft"); assert_equals(container.clientWidth, content.clientWidth, "auto clientWidth"); assert_equals(container.offsetWidth, content.offsetWidth, "auto offsetWidth"); }, "scrollbar-width auto defers to ::-webkit-scrollbar"); test(function () { let container = document.getElementById('container_thin'); let content = document.getElementById('content_thin'); assert_less_than(container.scrollWidth, container.offsetWidth, "thin scrollWidth"); assert_less_than(container.clientWidth, container.offsetWidth, "thin clientWidth"); assert_equals(container.offsetLeft, content.offsetLeft, "thin offsetLeft"); assert_equals(container.clientWidth, content.clientWidth, "thin clientWidth"); assert_not_equals(container.offsetWidth, content.offsetWidth, "thin offsetWidth"); }, "scrollbar-width thin overrides ::-webkit-scrollbar"); done(); } </script> <body onload="performTest()"> Test scrollbar-width: vertical scrollbar <div class="container auto" id="container_auto"> <div class="content" id="content_auto">auto</div> </div> <div class="container thin" id="container_thin"> <div class="content" id="content_thin">thin</div> </div> </body>