CSS Design Guide Notes_html/css_WEB-ITnose

1. In border, solid is a solid line and dashed is a dotted line

2.clear is a clear float

3. position has four values:

static. Normal document flow

relative. Relative position up, down, left and right

absolute. Absolute positioning, positioning for body or parent elements

fix: fixed positioning, not scrolling with the scroll bar

4.display: whether to display, it does not occupy space when not displayed

Visibility: Whether it is visible, occupying space when invisible

5.background-repeat: whether the background image is repeated

repeat. Default

repeat-x

repeat-y

no repeat. Not repeated

6.background-size: background image size

cover. Make the image completely fill the background area while maintaining the aspect ratio