Prioritize loading poster image of video LCP elements #1498
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thelovekesh
added
[Type] Feature
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TODO: Add test cases. |
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Yeah, sounds good. |
… add/lcp-poster-image-prioritize
westonruter
added
[Type] Enhancement
| * @param string $attribute_name Attribute name. | ||
| * @return string|true|null Normalized attribute value. | ||
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| protected function get_attribute_value( OD_HTML_Tag_Processor $processor, string $attribute_name ) { |
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I'd like to move this eventually into OD_HTML_Tag_Processor/OD_HTML_Processor. Also @dmsnell has suggested this could eventually be part of the core class as well, as most HTML attributes have their own dedicated logic to get back a normalized value.
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| * @return bool Whether the tag should be tracked in URL metrics. | ||
| */ | ||
| public function __invoke( OD_Tag_Visitor_Context $context ): bool { |
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@westonruter I suppose this is where I would add the logic for #1575?
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| $xpath = $processor->get_xpath(); | ||
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| // TODO: If $context->url_metric_group_collection->get_element_max_intersection_ratio( $xpath ) is 0.0, then the video is not in any initial viewport and the VIDEO tag could get the preload=none attribute added. |
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Thinking out loud for a future enhancement:
autoplay takes precedence over preload. Since we here know that the video is not in the initial viewport, we could remove autoplay in favor of an IntersectionObserver-based implementation that only autoplays the video when actually visible.
Thoughts? Worth creating an issue for it?
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Oh, interesting idea. Yes, I think that warrants an issue.
Related to #1035 which involves IntersectionObserver to lazy-load background images.
swissspidy
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swissspidy
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Overall looks pretty good, seems like a great base for further enhancements like #1575
Summary
Fixes #1183
Relevant technical choices