Chapter 10 - Visual formatting model details - 10.6 Calculating heights and margins
Go to the relevant page of the specification.
- background-root-020
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Background: Test Seventeen
Rules governing visual formating of block level non-replaced elements and calculations of height apply to the document root element just as to any other element. Document root element should not stretch vertically to fit the viewport; document root element should only be as tall as required to enclose its content. - root-box-001
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Placing the root element