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[css-variables] way to customize break points by variables #1883

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Jinjiang opened this issue Oct 16, 2017 · 1 comment
Closed

[css-variables] way to customize break points by variables #1883

Jinjiang opened this issue Oct 16, 2017 · 1 comment

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@Jinjiang
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Jinjiang commented Oct 16, 2017 •
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The background is as: https://stackoverflow.com/questions/40722882/css-native-variables-not-working-in-media-queries discussed.

Though I totally understand. But is there anyway to customize break points of a component outside with web standard but without any pre-processer?
Seems making variables in :root element [1] accessible for media query is the nearest way. But I am not sure about it.

An example:

I want to define a web component named <responsive-columns>. Its scoped style [2] is like:

/* in component */
@media (min-width: var(--break-point-min)) {
  :host > * {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(var(--column-width-min), 1fr);
  }
}

So other developers can use it like:

<html>
<head>
  ...
  <style>
  /* global stylesheet */
  :root {
    --break-point-min: 540px;
    --column-width-min: 200px;
  }
  </style>
</head>
<body>
  <responsive-columns>
    ...
  </responsive-columns>
</body>
</html>

Thanks.

[1] https://drafts.csswg.org/selectors-3/#root-pseudo
[2] https://drafts.csswg.org/css-scoping-1/#selectors
@tabatkins
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Can't use var() for this, even ones set on :root - you can use the results to change what gets set on :root. ^_^

But the more recently-proposed env() function from Apple, which sets up a guaranteed-global variable that doesn't depend on any element, is usable for this.

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@Jinjiang @tabatkins