Add PreloadHeroImage Optimizer transformer #5350
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schlessera
added
Optimizer
WS:Perf
westonruter
requested changes
Oct 21, 2020
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+37
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+39
| list($scheme, $host, $port, $user, $pass, $path, $query, $fragment) = array_values( | ||
| array_merge( | ||
| self::URL_DEFAULT_PARTS, |
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This feels a bit risky as it relies on the array keys being defined in the exact same order as the items in the list().
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Well, we control both, so why wouldn't they?
Co-authored-by: Weston Ruter <[email protected]>
Co-authored-by: Weston Ruter <[email protected]>
Co-authored-by: Weston Ruter <[email protected]>
Co-authored-by: Weston Ruter <[email protected]>
Co-authored-by: Weston Ruter <[email protected]>
This was referenced Nov 3, 2020
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This was referenced Nov 3, 2020
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Summary
This PR adds a new
PreloadHeroImagetransformer.This transformer optimizes image rendering times for hero images by adding preload and serverside-rendered
<img>tags when possible. Viable hero images are<amp-img>tags,<amp-video>tags with aposterattribute as well as<amp-iframe>and<amp-video-iframe>tags with aplaceholderattribute. The first viable image that is encountered is used by default, but this behavior can be overridden by adding thedata-heroattribute to a maximum of two images. The preloads only work work images that don't usesrcset, as that is not supported as a preload in most browsers. The serverside-rendered image will not be created for<amp-video>tags.Fixes #5055
Checklist