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<html><head><style>body { font-size:16px;}div { font-size: 2rem; border: 1px solid black;}</style></head><body><p>The font-size of this document is 16px.</p><div>The font-size of this div element is 2rem.</div><p>The rem unit sets the font-size relative to the browsers base font-size, and will not inherit from its parents.</p></body></html>