The red mark is the default value
1. border (border): border-top, border-bottom, border-left, border-right
1.border-color (border color);
2.border-width (border thickness): medium|thin|thick|value;
3.border-style (border style ):none|hidden|dotted|dashed|solid|
2. padding (padding): padding-top, padding-bottom, padding-left, padding-right
3. margin (margin): margin-top, margin-bottom, margin-left, margin-right
When margin is set to a negative number, it will cause the block set to a negative number to move in the opposite direction and set overlay on another block. When there is a parent-child relationship between blocks, the word block can be separated from the parent block by setting the margin of the child block to a negative number.
4. background-color: (background color)
1. When setting the background-color background color for an element, the area that IE works on is content padding, while Firefox uses content padding border. .
2. The body is a special box, and its background color will extend to the margin.
Abbreviated form of attribute:
1. If two attribute values are given, the former represents the upper and lower attributes, and the latter represents the left and right attributes.
2. If 3 attribute values are given, the former represents the upper attribute, the middle value represents the left and right attributes, and the latter represents the lower attribute.
3. If 4 attribute values are given, they represent the attributes of top, right, bottom, and left in order, sorted clockwise.
Classification of elements
1. Block-level elements (block): occupy one line
The vertical margin between block-level elements div1 and div2=MAX(margin_bottom of div1, div2's margin-top)
2. Inline elements (inline)
The horizontal margin between the inline elements span1 and span2=(span1's margin-right) (span2's margin-left)
Box float:
1. Set float: float:none|left|right
2. Clear float: clear:none|left |right|both

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HTML is suitable for beginners because it is simple and easy to learn and can quickly see results. 1) The learning curve of HTML is smooth and easy to get started. 2) Just master the basic tags to start creating web pages. 3) High flexibility and can be used in combination with CSS and JavaScript. 4) Rich learning resources and modern tools support the learning process.

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