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<!DOCTYPE html> <title>My Example</title> <style> h1 { counter-increment: h1-counter; counter-reset: h2-counter; } h1::before { content: counter(h1-counter); padding-right: 0.5em; } h2 { counter-increment: h2-counter; } h2::before { content: counter(h1-counter) "." counter(h2-counter); padding-right: 0.5em; } </style> <h1>Heading</h1> <h2>Heading</h2> <h2>Heading</h2> <h2>Heading</h2> <h1>Heading</h1> <h2>Heading</h2>
