Css front-end examination questions, css examination questions

Css front-end examination questions, css examination questions
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1. the similarities and differences between position absolute and fixed

Similarities: (1) the display mode of the element in the row is changed, and the display is set to block. (2) they are all out of the Document Stream and do not occupy space (3) by default, they will overwrite the Document Stream

Differences: (1) Compared with the parent element that is located at absolute, fixed is located at the browser window, and the position of the element relative to the browser window is unchanged when the page is scrolled.

2.

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