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wpt/css/css-values/line-break-ch-unit.html
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| <!DOCTYPE html> | |
| <title>CSS Values and Units Test: Lines of the ch unit can fit the specified number of characters</title> | |
| <link rel="help" href="https://drafts.csswg.org/css-values-3/#font-relative-lengths"> | |
| <script src="/resources/testharness.js"></script> | |
| <script src="/resources/testharnessreport.js"></script> | |
| <style> | |
| div { | |
| font-family: monospace; | |
| font-size: 10px; | |
| line-height: 1; | |
| } | |
| </style> | |
| <body> | |
| <div id=log></div> | |
| <script> | |
| (function() { | |
| // Test that lines do not wrap for elements of the width of | |
| // 'ch' unit that have the specified number of characters. | |
| let container = document.body; | |
| let should_fit = []; | |
| for (let i = 3; i < 100; i++) { | |
| let element = document.createElement('div'); | |
| element.style.width = `${i}ch`; | |
| element.textContent = `0 ${'0'.repeat(i - 2)}`; | |
| container.appendChild(element); | |
| should_fit.push(element); | |
| } | |
| // When the number of characters is +1, it should wrap. | |
| let should_wrap = []; | |
| for (let i = 3; i < 100; i++) { | |
| let element = document.createElement('div'); | |
| element.style.width = `${i}ch`; | |
| element.textContent = `0 ${'0'.repeat(i - 1)}`; | |
| container.appendChild(element); | |
| should_wrap.push(element); | |
| } | |
| for (let element of should_fit) { | |
| test(() => { | |
| assert_approx_equals(element.offsetHeight, 10, 1); | |
| }, `${element.style.width} should fit`); | |
| } | |
| for (let element of should_wrap) { | |
| test(() => { | |
| assert_approx_equals(element.offsetHeight, 20, 1); | |
| }, `${element.style.width} should wrap`); | |
| } | |
| })(); | |
| </script> | |
| </body> |