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Asked: 2026-06-14T14:02:27+00:00

When I minify my css with online css tool for example https://csscompressor.net/ , tool

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When I minify my css with online css tool for example https://csscompressor.net/, tool convert font-weight:bold to font-weight:700; , font-weight:normal to font-weight:400; why?700 or 400 usage for high performance?

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  1. Editorial Team

    In css, the font-weight property is a 9-point numeric scale from 100 to 900.

    As a convenience, the special names normal and bold are defined, and are given the values 400 and 700.

    (Other text values inherit, bolder, and lighter are calculated from the weight of the parent element as “same as parent”, “next higher value from list 100, 400, 700, 900” and “next lower value from list 100, 400, 700, 900“)

    For more details, the spec is at http://www.w3.org/TR/CSS21/fonts.html#font-boldness

    (So, when you write font-weight:bold, you really mean font-weight:700, and as the comments point out, the latter is one character shorter and so more “minimal”…)

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