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3.4 Consider using relative lengths instead of absolute in frameset.


Use relative rather than absolute units in the attribute values encoding (attribute value) and in the style sheets’ property values.


An example is to use 'em' or a percentage to specify font sizes and margins in CSS, instead of 'pt' or 'mm', which are absolute units of measurement.

Relative dimensions for style sheets

Relative dimensions in templates

Central setting that em is to be displayed in the distance selectors instead of px

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