Add PreloadHeroImage transformer #7
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Co-authored-by: Weston Ruter <westonruter@google.com>
Co-authored-by: Weston Ruter <westonruter@google.com>
Co-authored-by: Weston Ruter <westonruter@google.com>
Co-authored-by: Weston Ruter <westonruter@google.com>
Co-authored-by: Weston Ruter <westonruter@google.com>
Co-authored-by: Weston Ruter <westonruter@google.com>
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This PR was transferred over from ampproject/amp-wp#5350 and 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.