relative-units-005.html (1345B)
1 <!doctype html> 2 <title>CSS Media Queries Test: ex, ch, and ic from initial font</title> 3 <link rel="help" href="https://drafts.csswg.org/mediaqueries/#units"> 4 <script src="/resources/testharness.js"></script> 5 <script src="/resources/testharnessreport.js"></script> 6 <div id="ex_ref" style="width: 100ex"></div> 7 <div id="ch_ref" style="width: 100ch"></div> 8 <div id="ic_ref" style="width: 100ic"></div> 9 <script> 10 const viewport_width = document.documentElement.offsetWidth; 11 12 test(() => { 13 const viewport_ex = (viewport_width * 100) / ex_ref.offsetWidth; 14 const ex_query = `(min-width: ${viewport_ex-0.5}ex) and (max-width: ${viewport_ex+0.5}ex)`; 15 assert_true(matchMedia(ex_query).matches); 16 }, "ex unit in media queries should match initial font"); 17 18 test(() => { 19 const viewport_ch = (viewport_width * 100) / ch_ref.offsetWidth; 20 const ch_query = `(min-width: ${viewport_ch-0.5}ch) and (max-width: ${viewport_ch+0.5}ch)`; 21 assert_true(matchMedia(ch_query).matches); 22 }, "ch unit in media queries should match initial font"); 23 24 test(() => { 25 const viewport_ic = (viewport_width * 100) / ic_ref.offsetWidth; 26 const ic_query = `(min-width: ${viewport_ic-0.5}ic) and (max-width: ${viewport_ic+0.5}ic)`; 27 assert_true(matchMedia(ic_query).matches); 28 }, "ic unit in media queries should match initial font"); 29 </script>