Merging upstream version 5.3.0+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 0 insertions, 81 deletions

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----
-layout: docs
-title: Ratios
-description: Use generated pseudo elements to make an element maintain the aspect ratio of your choosing. Perfect for responsively handling video or slideshow embeds based on the width of the parent.
-group: helpers
-toc: true
----
-
-## About
-
-Use the ratio helper to manage the aspect ratios of external content like `<iframe>`s, `<embed>`s, `<video>`s, and `<object>`s. These helpers also can be used on any standard HTML child element (e.g., a `<div>` or `<img>`). Styles are applied from the parent `.ratio` class directly to the child.
-
-Aspect ratios are declared in a Sass map and included in each class via CSS variable, which also allows [custom aspect ratios](#custom-ratios).
-
-{{< callout info >}}
-**Pro-Tip!** You don't need `frameborder="0"` on your `<iframe>`s as we override that for you in [Reboot]({{< docsref "/content/reboot" >}}).
-{{< /callout >}}
-
-## Example
-
-Wrap any embed, like an `<iframe>`, in a parent element with `.ratio` and an aspect ratio class. The immediate child element is automatically sized thanks to our universal selector `.ratio > *`.
-
-{{< example >}}
-<div class="ratio ratio-16x9">
-  <iframe src="https://www.youtube.com/embed/zpOULjyy-n8?rel=0" title="YouTube video" allowfullscreen></iframe>
-</div>
-{{< /example >}}
-
-## Aspect ratios
-
-Aspect ratios can be customized with modifier classes. By default the following ratio classes are provided:
-
-{{< example class="bd-example-ratios" >}}
-<div class="ratio ratio-1x1">
-  <div>1x1</div>
-</div>
-<div class="ratio ratio-4x3">
-  <div>4x3</div>
-</div>
-<div class="ratio ratio-16x9">
-  <div>16x9</div>
-</div>
-<div class="ratio ratio-21x9">
-  <div>21x9</div>
-</div>
-{{< /example >}}
-
-## Custom ratios
-
-Each `.ratio-*` class includes a CSS custom property (or CSS variable) in the selector. You can override this CSS variable to create custom aspect ratios on the fly with some quick math on your part.
-
-For example, to create a 2x1 aspect ratio, set `--bs-aspect-ratio: 50%` on the `.ratio`.
-
-{{< example class="bd-example-ratios" >}}
-<div class="ratio" style="--bs-aspect-ratio: 50%;">
-  <div>2x1</div>
-</div>
-{{< /example >}}
-
-This CSS variable makes it easy to modify the aspect ratio across breakpoints. The following is 4x3 to start, but changes to a custom 2x1 at the medium breakpoint.
-
-```scss
-.ratio-4x3 {
-  @include media-breakpoint-up(md) {
-    --bs-aspect-ratio: 50%; // 2x1
-  }
-}
-```
-
-{{< example class="bd-example-ratios bd-example-ratios-breakpoint" >}}
-<div class="ratio ratio-4x3">
-  <div>4x3, then 2x1</div>
-</div>
-{{< /example >}}
-
-
-## Sass map
-
-Within `_variables.scss`, you can change the aspect ratios you want to use. Here's our default `$ratio-aspect-ratios` map. Modify the map as you like and recompile your Sass to put them to use.
-
-{{< scss-docs name="aspect-ratios" file="scss/_variables.scss" >}}