Test pages measuring the page-load impact of native loading="lazy" on YouTube and Facebook iframe embeds, with WebPageTest results.
What is the anton-karlovskiy/lazy-load-iframes GitHub project? Description: "Test pages measuring the page-load impact of native loading="lazy" on YouTube and Facebook iframe embeds, with WebPageTest results.". Written in HTML. Explain what it does, its main use cases, key features, and who would benefit from using it.
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