Summary of all summary function definitions and usages

All background properties cannot be inherited. 1. background-color can set the background color for all elements. The default value for background-color is transparent; that is, if an element does not specify a background color, the background is transparent so that the background of its ancestor elements is visible. 2. background-image All elements can set a background image; multiple background images can be set, separated by commas; the background images will be cascading, with the previous layer on top. 3. background-repeatrepeat (default)/no-repeat/repeat-x/ repeat-y4. background-attachmentscroll (default)/fixed 5. background-position pixel method: starting from the upper left corner of the image, the first value is horizontal The moving distance, the second value is the vertical moving distance; if only one value is specified, the second value defaults to 50%. Percent method: Percentage is applied to both images and elements, corresponding to

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