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[css-sizing] It's false that height: stretch behaves as stretch alignment #11784

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Loirooriol opened this issue Feb 26, 2025 · 1 comment
Open

[css-sizing] It's false that height: stretch behaves as stretch alignment #11784

Loirooriol opened this issue Feb 26, 2025 · 1 comment
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Agenda+ css-flexbox-1 Current Work css-sizing-4

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@Loirooriol
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Loirooriol commented Feb 26, 2025 •
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https://drafts.csswg.org/css-sizing-4/#stretch-fit-sizing

We have interoperability against this:

<!DOCTYPE html>
<style>
.container { display: inline-flex; vertical-align: top; width: 100px; height: 100px; border: solid; flex-wrap: wrap; align-content: start }
.stretch { height: -moz-available; height: -webkit-fill-available; height: stretch }
</style>
<div class="container">
  <div class="stretch" style="width: 75px; border: solid cyan">a</div>
  <div class="stretch" style="width: 75px; border: solid magenta">b</div>
</div>
<div class="container">
  <div class="stretch" style="width: 75px; border: solid cyan">a</div>
  <div style="border: solid orange; height: 150px"></div>
  <div class="stretch" style="width: 75px; border: solid magenta">b</div>
</div>
<div class="container">
  <div style="width: 75px; border: solid cyan;">a</div>
  <div style="width: 75px; border: solid magenta">b</div>
</div>
<div class="container">
  <div style="width: 75px; border: solid cyan;">a</div>
  <div style="border: solid orange; height: 150px"></div>
  <div style="width: 75px; border: solid magenta">b</div>
</div>

Gecko, Blink and WebKit agree:

  • When computing the size of the flex lines: height: stretch stretches against the containing block, while align-self: stretch doesn't stretch.
  • Once we know the size of the flex lines: height: stretch keeps stretching against the containing block, while align-self: stretch stretches against the line.

If the flex container doesn't have a definite height (remove height: 100px):

  • Gecko and Blink don't stretch height: stretch, neither when computing line sizes nor once we know their size. align-self stretches in the latter one:

  • WebKit does that thing of stretching all ancestors with indefinite size, in this case filling the window:
@Loirooriol
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BTW, same for a column flexbox:

<!DOCTYPE html>
<style>
.container { display: flex; flex-direction: column; width: 100px; height: 100px; border: solid; flex-wrap: wrap; align-content: start }
.stretch { width: -moz-available; width: -webkit-fill-available; width: stretch }
</style>
<div class="container">
  <div class="stretch" style="height: 75px; border: solid cyan">a</div>
  <div class="stretch" style="height: 75px; border: solid magenta">b</div>
</div>
<div class="container">
  <div class="stretch" style="height: 75px; border: solid cyan">a</div>
  <div style="border: solid orange; width: 150px"></div>
  <div class="stretch" style="height: 75px; border: solid magenta">b</div>
</div>
<div class="container">
  <div style="height: 75px; border: solid cyan;">a</div>
  <div style="height: 75px; border: solid magenta">b</div>
</div>
<div class="container">
  <div style="height: 75px; border: solid cyan;">a</div>
  <div style="border: solid orange; width: 150px"></div>
  <div style="height: 75px; border: solid magenta">b</div>
</div>

With width: min-content; max-width: 100px:

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@Loirooriol