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apply some borders to a SPAN element without anymargins or padding, we'd get results such as that shown inFigure 8-57.

Figure 8-57

Figure 8-57. Inline borders and line-box layout

The borders are placed as they are because the border edge of inlineelements is controlled by the font-size, not theline-height. In other words, if aSPAN element has a font-size of12pt and a line-height of

The containing block of the "root element" (also called the initial containing block) is established by the user agent. In HTML, the root element is the HTML element, although some browsers may incorrectly use BODY.

  • For nonroot elements that are not absolutely positioned, the containing block for an element is set as the content edge of the nearest block-level ancestor. This is true even in relative