| <!DOCTYPE html> |
| <link rel="help" href="https://drafts.csswg.org/css-ui-4/#field-sizing"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| textarea { |
| font-family: monospace; |
| } |
| |
| .disable-default { |
| field-sizing: content; |
| } |
| |
| .small-placeholder { |
| font-size: 32px; |
| } |
| .small-placeholder::placeholder { |
| font-size: 16px; |
| } |
| |
| .large-placeholder { |
| font-size: 20px; |
| } |
| .large-placeholder::placeholder { |
| font-size: 40px; |
| } |
| </style> |
| <body> |
| <div id="container"></div> |
| <script> |
| const DISABLE = 'class="disable-default"'; |
| const LONG_TEXT = 'The quick brown fox jumps over the lazy dog.'; |
| |
| function addElements(source) { |
| const container = document.querySelector('#container'); |
| container.innerHTML = source + source; |
| container.lastElementChild.classList.add('disable-default'); |
| return { |
| fixed: container.firstElementChild, |
| content: container.lastElementChild |
| }; |
| } |
| |
| function addTwoElements(source1, source2) { |
| const container = document.querySelector('#container'); |
| container.innerHTML = source1 + source2; |
| return { |
| e1: container.firstElementChild, |
| e2: container.lastElementChild |
| }; |
| } |
| |
| test(() => { |
| let pair = addElements('<textarea></textarea>'); |
| // Historically a <textarea> has approximately 20ch x 2lh size by default. |
| // A <textarea> with field-sizing:content must be samller than the default. |
| assert_less_than(pair.content.offsetWidth, pair.fixed.offsetWidth); |
| assert_less_than(pair.content.offsetHeight, pair.fixed.offsetHeight); |
| |
| pair = addTwoElements(`<textarea ${DISABLE}></textarea>`, `<textarea ${DISABLE}>foo</textarea>`); |
| assert_less_than(pair.e1.offsetWidth, pair.e2.offsetWidth); |
| assert_equals(pair.e1.offsetHeight, pair.e2.offsetHeight); |
| }, 'Empty value'); |
| |
| test(() => { |
| let pair = addElements('<textarea cols="10" rows="3"></textarea>'); |
| assert_less_than(pair.content.offsetWidth, pair.fixed.offsetWidth); |
| assert_less_than(pair.content.offsetHeight, pair.fixed.offsetHeight); |
| }, 'Empty value with cols/rows'); |
| |
| test(() => { |
| let pair = addElements(`<textarea>${LONG_TEXT}</textarea>`); |
| assert_greater_than(pair.content.offsetWidth, pair.fixed.offsetWidth); |
| pair = addElements(`<textarea placeholder="${LONG_TEXT}"></textarea>`); |
| assert_greater_than(pair.content.offsetWidth, pair.fixed.offsetWidth); |
| }, 'Auto width and auto height with a long text'); |
| |
| test(() => { |
| let pair = addElements('<textarea style="width:20ch; height:2lh"></textarea>'); |
| assert_equals(pair.content.offsetWidth, pair.fixed.offsetWidth); |
| assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight); |
| |
| pair = addElements(`<textarea style="width:20ch; height:2lh">${LONG_TEXT}</textarea>`); |
| assert_equals(pair.content.offsetWidth, pair.fixed.offsetWidth); |
| assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight); |
| |
| pair = addElements(`<textarea style="width:20ch; height:2lh" placeholder="${LONG_TEXT}"></textarea>`); |
| assert_equals(pair.content.offsetWidth, pair.fixed.offsetWidth); |
| assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight); |
| }, 'Explicit width and heigth'); |
| |
| test(() => { |
| let pair = addElements('<textarea style="width:20ch"></textarea>'); |
| assert_equals(pair.content.offsetWidth, pair.fixed.offsetWidth); |
| assert_less_than(pair.content.offsetHeight, pair.fixed.offsetHeight); |
| |
| pair = addElements(`<textarea style="width:20ch">${LONG_TEXT}</textarea>`); |
| assert_equals(pair.content.offsetWidth, pair.fixed.offsetWidth); |
| assert_greater_than(pair.content.offsetHeight, pair.fixed.offsetHeight); |
| |
| pair = addElements(`<textarea style="width:20ch" placeholder="${LONG_TEXT}"></textarea>`); |
| assert_equals(pair.content.offsetWidth, pair.fixed.offsetWidth); |
| assert_greater_than(pair.content.offsetHeight, pair.fixed.offsetHeight); |
| }, 'Explicit width and auto height'); |
| |
| test(() => { |
| let pair = addElements('<textarea style="height:2lh"></textarea>'); |
| assert_less_than(pair.content.offsetWidth, pair.fixed.offsetWidth); |
| assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight); |
| |
| pair = addElements(`<textarea style="height:2lh">${LONG_TEXT}</textarea>`); |
| assert_greater_than(pair.content.offsetWidth, pair.fixed.offsetWidth); |
| assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight); |
| |
| pair = addElements(`<textarea style="height:2lh" placeholder="${LONG_TEXT}"></textarea>`); |
| assert_greater_than(pair.content.offsetWidth, pair.fixed.offsetWidth); |
| assert_equals(pair.content.offsetHeight, pair.fixed.offsetHeight); |
| }, 'Explicit height and auto width'); |
| |
| test(() => { |
| let pair = addTwoElements(`<textarea class="disable-default small-placeholder"></textarea>`, |
| `<textarea class="disable-default small-placeholder" placeholder="foo"></textarea>`); |
| assert_less_than(pair.e1.offsetWidth, pair.e2.offsetWidth); |
| assert_equals(pair.e1.offsetHeight, pair.e2.offsetHeight); |
| }, 'Text caret is taller than the placeholder'); |
| |
| test(() => { |
| let pair = addTwoElements(`<textarea class="disable-default large-placeholder"></textarea>`, |
| `<textarea class="disable-default large-placeholder" placeholder="foo"></textarea>`); |
| assert_less_than(pair.e1.offsetWidth, pair.e2.offsetWidth, 'width'); |
| assert_less_than(pair.e1.offsetHeight, pair.e2.offsetHeight, 'height'); |
| }, 'Text caret is shorter than the placeholder'); |
| |
| test(() => { |
| const container = document.querySelector('#container'); |
| container.innerHTML = '<textarea></textarea>'; |
| const element = container.firstChild; |
| const w = element.offsetWidth; |
| const h = element.offsetHeight; |
| element.classList.add('disable-default'); |
| assert_less_than(element.offsetWidth, w); |
| assert_less_than(element.offsetHeight, h); |
| }, 'Update field-sizing property dynamically'); |
| </script> |
| </body> |
