By default in most browsers, 1 rem = ____.

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The correct answer is that by default in most browsers, 1 rem is equal to 16px. The 'rem' unit stands for "root em" and is relative to the font size of the root element of the document, which is typically the <html> element. Most browsers set the default font size for the root element to 16 pixels, making calculations straightforward.

Thus, if a developer specifies a font size of 2 rem, it would compute to 32 pixels (2 x 16px). This unit is particularly useful when designing for responsive layouts, as it allows for scalable typography and spacing that changes proportionally with the base font size.

Understanding this default value helps in creating consistent and accessible web designs, as it ensures that all rem-sized elements relate directly to the base size that the user’s browser is set to, which can also be adjusted by the user for readability or accessibility purposes.

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