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[css-size-adjust] Clarify interaction between text-size-adjust and em units #11636

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progers opened this issue Feb 3, 2025 · 0 comments
Open

[css-size-adjust] Clarify interaction between text-size-adjust and em units #11636

progers opened this issue Feb 3, 2025 · 0 comments

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@progers
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progers commented Feb 3, 2025

It is not clear how text-size-adjust and em units should interact (spec). Not adjusting em units leads to clipped text. Adjusting em units leads to double-adjustment of line-height.

Example (live):

<!doctype html>
<meta name="viewport" content="width=device-width">
<style>
  html { -webkit-text-size-adjust: 250%; text-size-adjust: 250%; }
</style>

<p>
  height (em, px):
  <div style="height: 1em; width: 16px; background: lightblue; display: inline-block;">a</div>
  <div style="height: 16px; width: 16px; background: lightgreen; display: inline-block;">a</div>
</p>

<p>
  border-width (em, px):
  <div style="border-top: 1em solid blue; width: 16px; background: lightblue; display: inline-block;">a</div>
  <div style="border-top: 16px solid green; width: 16px; background: lightgreen; display: inline-block;">a</div>
</p>

<p>
  line-height (em, px):
  <div style="line-height: 1em; width: 16px; background: orange; display: inline-block;">a</div>
  <div style="line-height: 16px; width: 16px; background: purple; display: inline-block;">a</div>
</p>

Comparison between Webkit (left) and Chromium (right):
Image
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@progers