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Fundamentals / 6 questions

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1 How does the browser decide which image format and size to load with `srcset`/`sizes`? Medium
2 What does the `<meta viewport>` tag do, and what breaks without it? Easy
3 What are Open Graph tags, and why do they matter for link sharing? Medium
4 What's the difference between `robots.txt`, meta robots, and a sitemap for SEO? Medium
5 How does lazy-loading images with `loading="lazy"` work, and what are its limits? Medium
6 What is the difference between server-rendered and client-rendered HTML for crawlers? Hard