| <!DOCTYPE html> |
| <title>HTML: widgets' baseline alignment and interaction with 'overflow'</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <!-- |
| This test tests where the baseline is for different widgets. |
| This isn't yet specified, see https://github.com/whatwg/html/issues/5065 |
| |
| Where the baseline is affects where *other* things on the same linebox are positioned. So this test |
| makes assertions about the offsetTop for a previous sibling <span>, and compares it to a reference |
| that has equivalent setup but using a styled <span> instead of an actual widget (where possible) so |
| we can control where its baseline will be (assuming a correct CSS implementation). |
| |
| CSS has the following behavior regarding baselines (this is non-normative, also read the spec): |
| |
| * for a normal inline containing text, the baseline is the same as the text's baseline. |
| * for replaced elements (like images), the baseline is at the bottom margin-box edge. |
| * for an inline-block, it depends on its 'overflow': |
| - 'visible': the baseline is the same as the baseline for the last line box in the inline-block. |
| - otherwise: the baseline is like replaced elements. |
| |
| The baselines for different widgets, as implemented in Firefox, are as follows: |
| |
| <input type=text> |
| <input type=search> |
| <input type=tel> |
| <input type=email> |
| <input type=password> |
| <input type=date> |
| <input type=month> |
| <input type=week> |
| <input type=time> |
| <input type=datetime-local> |
| <input type=number> |
| <input type=submit> |
| <input type=reset> |
| <input type=button> |
| Like inline-block but 'overflow' is forced to 'visible' and text inside is vertically centered. |
| |
| <input type=checkbox> with 'appearance: auto' |
| <input type=radio> with 'appearance: auto' |
| At the border-box edge. (Since baseline at border-box edge isn't a behavior CSS has normally, we |
| fake it in the references with the 'no-margin-bottom' class.) |
| |
| <input type=color> |
| At the content-box edge. |
| |
| <input type=file> |
| Like inline-block but 'overflow' is forced to to 'visible' and it contains a button; the button |
| can affect where the baseline is. |
| |
| <input type=image> showing alt text, with 'overflow: visible' |
| Like inline-block. |
| |
| <input type=image> showing an image |
| <input type=image> showing alt text, with 'overflow' something other than 'visible' |
| <input type=range> |
| <input type=checkbox> with 'appearance: none' |
| <input type=radio> with 'appearance: none' |
| Like replaced elements. |
| |
| --> |
| <style> |
| .test { |
| border-collapse: collapse; |
| font-size: 10px; |
| } |
| .test td { |
| border: none; |
| padding: 0; |
| margin:0; |
| outline: 1px solid silver; |
| } |
| |
| .test td > input, |
| .ref td > .fake-input-text, |
| .ref td > .inline-block, |
| .ref td > img, |
| .ref td > button { |
| font: inherit; |
| height: 60px; |
| width: 60px; |
| padding: 10px; |
| box-sizing: border-box; |
| margin: 10px 0; |
| /* Note: a border is not specified because that would imply 'appearance: none' for some widgets */ |
| } |
| .ref button img { |
| height: 100%; |
| width: 100%; |
| display: block; |
| } |
| /* Use inline-grid instead of inline-block here to more easily center the text inside */ |
| .ref .fake-input-text { |
| display: inline-grid; |
| border: 2px solid; /* 2px matches UA default style */ |
| align-items: center; |
| } |
| .ref .inline-block { |
| display: inline-block; |
| } |
| .ref td > img.no-margin-bottom { |
| margin-bottom: 0; |
| } |
| [style*="appearance: none;"] { |
| -webkit-appearance: none; /* TODO(zcorpan) remove this when unprefixed appearance is supported */ |
| } |
| </style> |
| <div id="log"></div> |
| <h2>refs</h2> |
| <!-- |
| The first span's offsetTop is what we want to compare with the corresponding test's span's offsetTop. |
| The sibling element is there to control where the baseline for the line box will be. |
| --> |
| <table class="test ref"> |
| <tr class="ref-text-input-like"><td><span>ref-text-input-like</span> <span class=fake-input-text>x</span> |
| <tr class="ref-checkbox-input-appearance-auto-like"><td><span>ref-checkbox-input-appearance-auto-like</span> <img class=no-margin-bottom src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAMCAIAAAD3UuoiAAAAGklEQVQoz2Nk%2BP%2BfgRqAiYFKYNSgUYOGp0EA%2BQMCFrJdTgsAAAAASUVORK5CYII%3D"> |
| <tr class="ref-color-input-like"><td><span>ref-color-input-like</span> <button><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAMCAIAAAD3UuoiAAAAGklEQVQoz2Nk%2BP%2BfgRqAiYFKYNSgUYOGp0EA%2BQMCFrJdTgsAAAAASUVORK5CYII%3D"></button> |
| <tr class="ref-file-input-like"><td><span>ref-file-input-like</span> <span class=inline-block><button>x</button></span> |
| <tr class="ref-image-input-showing-alt-overflow-visible-like"><td><span>ref-image-input-showing-alt-overflow-visible-like</span> <span class=inline-block>x</span> |
| <tr class="ref-image-input-showing-image-like"><td><span>ref-image-input-showing-image-like</span> <img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAMCAIAAAD3UuoiAAAAGklEQVQoz2Nk%2BP%2BfgRqAiYFKYNSgUYOGp0EA%2BQMCFrJdTgsAAAAASUVORK5CYII%3D"> |
| </table> |
| <h2>template table</h2> |
| <!-- |
| Each row in this table will be cloned into #test-table for each combination of styles to test. |
| --> |
| <table id="template-table"> |
| <tr><td><span>text</span> <input type=text value=x></td></tr> |
| <tr><td><span>search</span> <input type=search value=x></td></tr> |
| <tr><td><span>tel</span> <input type=tel value=x></td></tr> |
| <tr><td><span>url</span> <input type=url value="data:,x"></td></tr> |
| <tr><td><span>email</span> <input type=email value=x></td></tr> |
| <tr><td><span>password</span> <input type=password value=x></td></tr> |
| <tr><td><span>date</span> <input type=date value="2020-01-01"></td></tr> |
| <tr><td><span>month</span> <input type=month value="2020-01"></td></tr> |
| <tr><td><span>week</span> <input type=week value="2020-W01"></td></tr> |
| <tr><td><span>time</span> <input type=time value="00:00"></td></tr> |
| <tr><td><span>datetime-local</span> <input type=datetime-local value="2020-01-01T00:00"></td></tr> |
| <tr><td><span>number</span> <input type=number value=0></td></tr> |
| <tr><td><span>range</span> <input type=range></td></tr> |
| <tr><td><span>color</span> <input type=color value=#000000></td></tr> |
| <tr><td><span>checkbox</span> <input type=checkbox></td></tr> |
| <tr><td><span>radio</span> <input type=radio></td></tr> |
| <tr><td><span>file</span> <input type=file></td></tr> |
| <tr><td><span>submit</span> <input type=submit value=x></td></tr> |
| <tr><td><span>image</span> <input type=image src="data:,broken" alt="x"></td></tr> |
| <tr><td><span>image-with-src</span> <input type=image src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAMCAIAAAD3UuoiAAAAGklEQVQoz2Nk%2BP%2BfgRqAiYFKYNSgUYOGp0EA%2BQMCFrJdTgsAAAAASUVORK5CYII%3D" alt="x"></td></tr> |
| <tr><td><span>reset</span> <input type=reset value=x></td></tr> |
| <tr><td><span>button</span> <input type=button value=x></td></tr> |
| </table> |
| <h2>tests</h2> |
| <!-- |
| This table gets populated by the script. |
| --> |
| <table class="test" id="test-table"><tbody></tbody></table> |
| <script> |
| "use strict"; |
| |
| promise_setup(async () => { |
| const templateTable = document.querySelector('#template-table'); |
| const testTBody = document.querySelector('#test-table tbody'); |
| |
| const templateRows = templateTable.querySelectorAll('tr'); |
| for (const templateRow of templateRows) { |
| for (const appearanceValue of ["auto", "none"]) { |
| for (const overflowValue of ['visible', 'hidden', 'scroll']) { |
| const clonedRow = templateRow.cloneNode(true); |
| clonedRow.querySelector('input').setAttribute('style', `overflow: ${overflowValue}; appearance: ${appearanceValue};`); |
| testTBody.append(clonedRow); |
| } |
| } |
| } |
| |
| // wait for images to load |
| await new Promise(resolve => window.onload = e => resolve()); |
| for (const img of document.images) { |
| assert_true(img.complete); // either error state or loaded |
| } |
| |
| // get layout info from refs |
| const refTextInputLikeOffsetTop = document.querySelector('.ref-text-input-like span').offsetTop; |
| const refCheckboxInputAppearanceAutoLikeOffsetTop = document.querySelector('.ref-checkbox-input-appearance-auto-like span').offsetTop; |
| const refColorInputLikeOffsetTop = document.querySelector('.ref-color-input-like span').offsetTop; |
| const refFileInputLikeOffsetTop = document.querySelector('.ref-file-input-like span').offsetTop; |
| const refImageInputShowingAltOverflowVisibleLikeOffsetTop = document.querySelector('.ref-image-input-showing-alt-overflow-visible-like span').offsetTop; |
| const refImageInputShowingImageLikeOffsetTop = document.querySelector('.ref-image-input-showing-image-like span').offsetTop; |
| |
| function expectedOffsetTop(input) { |
| // TODO(zcorpan) https://github.com/whatwg/html/issues/5065 |
| // for now this is intended to match Firefox |
| const style = input.getAttribute('style'); |
| const src = input.getAttribute('src'); |
| switch (input.type) { |
| case 'file': |
| return refFileInputLikeOffsetTop; |
| case 'range': |
| return refImageInputShowingImageLikeOffsetTop; |
| case 'color': |
| return refColorInputLikeOffsetTop; |
| case 'checkbox': |
| case 'radio': |
| return (style.includes('appearance: none;')) ? refImageInputShowingImageLikeOffsetTop : refCheckboxInputAppearanceAutoLikeOffsetTop; |
| case 'image': |
| return (src === 'data:,broken' && style.includes('overflow: visible;')) ? refImageInputShowingAltOverflowVisibleLikeOffsetTop : refImageInputShowingImageLikeOffsetTop; |
| default: |
| return refTextInputLikeOffsetTop; |
| } |
| } |
| |
| function testName(markup) { |
| return markup.replace(/data:image\/png[^"]+/, 'data:(png)'); |
| } |
| |
| for (const row of testTBody.children) { |
| const input = row.firstChild.lastElementChild; |
| // FIXME: This test makes assumptions about default form control styling |
| // that don't hold in all platforms. |
| const allowedDelta = 3; |
| // This is not using test() because promise_setup() only allows promise_test(). |
| promise_test(async () => { |
| assert_equals(input.type, input.getAttribute('type'), 'input type should be supported') |
| const offsetTopActual = row.firstChild.firstChild.offsetTop; |
| assert_approx_equals(offsetTopActual, expectedOffsetTop(input), allowedDelta, '<span>.offsetTop'); |
| }, testName(input.outerHTML)); |
| } |
| }); |
| </script> |