CSS(Cascading Style Sheet, cascading style sheet) is used to beautifyHTMLweb pages.
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1. Style sheet
(1) Classification of style sheets
1.Inline style sheet
andHTMLare jointly displayed, with precise control, but poor reusability and more redundancy.
Example:
Inline style sheet
2.Embedded style sheet
is embedded in the web page as an independent area and must be written in theheadtag.
3.
External style sheetCreate a newCSSfile to place the style sheet. If you want to call the style sheet in theHTML
file, you need to right-click→CSSStyle Sheet→in theHTMLfile to attach the style sheet. Generally uselinkto connect.Some tags have default margins, which are generally removed when writing style sheet code (other styles can also be set), as follows:
1.Tag selector. Use tag name as selector.
2.class
Selector. They all start with
3.ID
Selector. Start with
4.
Composite Selector
(1) is separated by"
,", indicating juxtaposition.
(2) are separated by spaces to indicate descendants.
(3) Filter".".
2. Style attributes
(1) Background and foreground
1.Background:
2.Foreground font:
(2) Borders and borders
border(table border, style, etc.),margin(outside table spacing).padding(content and cell spacing).
(3) Lists and Blocks
width,height, (top,bottom,left,right) are only useful in absolute coordinates.
Linkedstyle:
a:linkThe state before the hyperlink is clicked
a:visitedStatus after clicking the hyperlink
a:hoverWhen hovering over a hyperlink
a:activeWhen a hyperlink is clicked
When defining these states, there is an orderl v h a
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