9. proficient in CSS and HTML design patterns (positioning: Advanced)

This chapter summarizes all Positioning

I. Align left

Center block elements

Invalid inline Element

① Align the content left and assign the text-align: left value to the block element, because the inline element contains the content size.

② Set the size of the left-aligned element magin-left: 0 align it left, use margin-right: auto to block its right alignment, for absolute positioning elements, use left: 0 left alignment, right: auto to prevent it from right alignment

③ To create a left-aligned and stretched element, you can use width: auto, margin-left: 0, margin-right: 0 to stretch its width to the left and right. For an absolute element, you can use left: 0 and right: 0 to stretch it to the left and right sides.

④ Create a left-aligned package element left: 0 or margin-left: 0

Note: IE6 does not support stretching.

2. Left offset

Margin-left: positive value offset to the right negative value offset to the left

3. Right alignment

Align with left

4. Right offset

Offset from the left

5. Center alignment

Content center alignment text-align: center

Center-aligned left: 0px; right: 0px; margin-left: auto; margin-right: auto