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Matt Kane

@mk.gg

Matt Kane

This one confuses a lot of Astro users. .astro is more like HTML than like JSX. Duplicated HTML attributes don't override the first instance: the compiler emits them in the HTML, which the browser then interprets like this.

What will be the class of the body? <body class='a' class='b'> The class of the body will be 'a'. It's simple. Once an attribute with a particular name is known, any other attributes with that same name will be ignored by the tokenizer.

But Sam, how well you YOU know the HTML parser? (The quiz is almost 10 years old now, but just as impossible) html5te.st/quiz/

html5te.st
August 18, 2025 at 9:27 AM UTC
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