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Add height:auto to video in Video block #37052

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@westonruter westonruter commented Dec 2, 2021

This amends #30092 which added height:auto to some video elements but didn't include the video in the Video block.

Description

In the AMP plugin we add width and height attributes to videos in order to prevent layout shifts, which are currently a reality with videos in the Video block since no dimensions are provided as they are for img elements:

video-layout-shift.mov

However, at the moment adding the width and height is currently causing the video to be stretched. By adding height:auto, the stretching is eliminated.

Without height:auto With height:auto
Stretched video Unstretched video

How has this been tested?

Screenshots

Types of changes

Checklist:

  • My code is tested.
  • My code follows the WordPress code style.
  • My code follows the accessibility standards.
  • I've tested my changes with keyboard and screen readers.
  • My code has proper inline documentation.
  • I've included developer documentation if appropriate.
  • I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).

@westonruter westonruter marked this pull request as draft December 2, 2021 05:32
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Size Change: +21 B (0%)

Total Size: 1.1 MB

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@aristath
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aristath commented Dec 2, 2021

Perhaps we could do something similar to what we did in the twentytwentyone theme?
We basically added a script to get the width & height of the video, and then set the height using % units to keep the perspective correct. See https://github.com/WordPress/WordPress/blob/5.8/wp-content/themes/twentytwentyone/assets/js/responsive-embeds.js for details

@westonruter
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But relying on a script to obtain the width/height on the frontend is not optimal for performance, right? That will result in layout shift when the script runs. I thought the point of browsers implementing a default aspect-ratio based on the width and height would eliminate the need for this, and so it's better if the width/height are added to the video element.

The AMP plugin is obtaining the width and height via wp_get_attachment_metadata(): https://github.com/ampproject/amp-wp/blob/9b483e02e00b880e48e4b943e5c07e9441904bae/includes/embeds/class-amp-core-block-handler.php#L186-L213

In any case, I'm seeing some strange browser behavior for video even when it has a width and height defined up-front, where it seems to have no effect at all. Layout shift is still happening for video but not for img: https://video-layout-shift-despite-aspect-ratio.glitch.me/

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aristath commented Dec 2, 2021

I think we could combine the 2... A PHP implementation makes more sense than a JS one as it will be more performant and will avoid layout shifts like you said.
But instead of using width & height, we could maybe add style="width: 100%; height: {x}%" to implement the aspect-ratio 🤔

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westonruter commented Dec 2, 2021

My understanding is that only setting the width and height attributes will populate a default aspect-ratio. With that populated, setting width:100% (and height:auto?) should then allow the element to resize and preserve its aspect ratio without any initial layout shift. See aspect-ratio on MDN:

Mapping width and height to aspect-ratio

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aristath commented Dec 2, 2021

The reason I'm a bit hesitant with using aspect-ratio is that Safari only started supporting it in v15 released a couple of months ago... which means a large portion of users on older devices (~14% on both desktop & mobile versions) won't benefit from it.

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