| <!doctype html> |
| <title>CSS Media Queries Test: ex and ch from initial font</title> |
| <link rel="help" href="https://drafts.csswg.org/mediaqueries/#units"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <div id="ex_ref" style="width: 100ex"></div> |
| <div id="ch_ref" style="width: 100ch"></div> |
| <script> |
| const viewport_width = document.documentElement.offsetWidth; |
| |
| test(() => { |
| const viewport_ex = (viewport_width * 100) / ex_ref.offsetWidth; |
| const ex_query = `(min-width: ${viewport_ex-0.5}ex) and (max-width: ${viewport_ex+0.5}ex)`; |
| assert_true(matchMedia(ex_query).matches); |
| }, "ex unit in media queries should match initial font"); |
| |
| test(() => { |
| const viewport_ch = (viewport_width * 100) / ch_ref.offsetWidth; |
| const ch_query = `(min-width: ${viewport_ch-0.5}ch) and (max-width: ${viewport_ch+0.5}ch)`; |
| assert_true(matchMedia(ch_query).matches); |
| }, "ch unit in media queries should match initial font"); |
| </script> |
