| <!DOCTYPE html> |
| <title>Flex minimum height of image with intrinsic min-height specified</title> |
| <link rel="author" title="dgrogan@chromium.org" href="mailto:dgrogan@chromium.org" /> |
| <link rel="help" href="https://drafts.csswg.org/css-flexbox/#min-size-auto" /> |
| <link rel="help" href="https://drafts.csswg.org/css-sizing-3/#valdef-width-min-content" /> |
| <link rel="match" href="../reference/ref-filled-green-100px-square-only.html" /> |
| <link rel="bookmark" href="https://crbug.com/1088223"> |
| <meta name="assert" content="Flex uses automatic minimum sizes when item specifies min-height:intrinsic, because that is treated as auto."> |
| |
| <p>Test passes if there is a filled green square.</p> |
| |
| <!-- |
| Here's the spec trail why the height of this item is 100px. |
| |
| 1. The column flexbox has height:0, and the item has flex-shrink: 1. So |
| min-height will determine the item's flexed height. |
| |
| 2. The min-content value of the min-height property is equivalent to the |
| automatic size, per https://drafts.csswg.org/css-sizing-3/#valdef-width-min-content, |
| because it's in the item's block dimension. (Blink legacy flex disagrees here) |
| |
| 3. Per https://drafts.csswg.org/css-flexbox/#min-size-auto, the used value of a |
| main axis automatic minimum size on a flex item that is not a scroll container |
| is a content-based minimum size. |
| |
| 4. The content-based min size of this item is min(content size suggestion, |
| specified size suggestion). We ignore transferred size suggestion because |
| this item has a specified size. |
| |
| 5. content size suggestion = 150, because 150 is the min-content size in the |
| main axis. |
| |
| 6. specified size suggestion = 100px because that's what's specified. |
| |
| 7. So content-based min size = min(150, 100) = 100px. That becomes its flexed |
| height (see #1). |
| |
| 8. Then, the item stretches its width to 100px. The item has an aspect ratio, |
| so does the new width change the height? Not according to |
| https://drafts.csswg.org/css-flexbox/#algo-stretch, which says "Note that |
| this step does not affect the main size of the flex item, even if it has an |
| intrinsic aspect ratio." The height remains 100px. |
| |
| FF 77 gives the item height of 50px. It's probably due to a disagreement in #8; |
| I think FF applies the aspect ratio of the new stretched width to get a height. |
| But it might be a disagreement in #4. |
| |
| Chrome <= 83 gives the item height 150 because it doesn't treat |
| min-height:min-content as min-height:auto. That makes the used min-height be |
| 150px. That might change in Chrome 84 or 85 when FlexNG launches. |
| |
| --> |
| <div style="display: flex; flex-direction: column; width:100px; height: 0px;"> |
| <img src="support/300x150-green.png" style="display: flex; min-height: min-content; height: 100px;" /> |
| </div> |
