By default, the width and height of the header are automatically adjusted according to the content. We can also manually set the width and height of the header.
Basic Grammar

Grammar explanation
Define the width of the header through attributes, which define the height of the header in pixels or percentages.
File example: 10-39.htm
Set the width and height of the header.
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Mainstream web design software

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网页图像软件	Fireworks
网页制作软件	Dreamweaver
网页动画软件	Flash

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20 21 22 23 File Description Line 11 defines the width of the table to be 400 pixels and the height to be 100 pixels. Line 13 defines the width of the header to be 300 pixels and the height to be 50 pixels.