Some learning points of HTML + CSS

1. When td occupies multiple rows/columns, the td squeezed out by it is not written (but the tr wrapping the td must be written)

2. The text in the element of display:td is not vertically centered by default ( The text in the td in the table is vertically centered)

3.th Although the header title is defined, it does not span rows by default (colspan is required to span rows)

4.text-indent Can be inherited

5.

is a block element

6.

is a block element, but the width does not default to its parent The width of the element is 100%

7. When the total width of td is greater than the width of the set table, the width of the table shall prevail

8.for=" name">Text A where the value of for can be name and id, where name comes from I can have a name" id="You can also have an ID”> tag, the id name comes from all tags (

I only have an id, it’s best not to give me a name)

9.

is a very strange element. Its default width is adaptive, but after adding a background color to it, it displays in full screen!

10. For single-line text, use line-height for vertical centering. For multi-line text, use after wrapping it, add style vertical-align: middle;

11. Overflowing text in sibling elements will cause squeezing , and overflowing pictures and element frames will not squeeze sibling elements

12.width / height = 100% When the parent element does not set a width, there is no width (it will not look up for ancestor elements)

13.Fixed width/fixed height The layout method is not the same It will deform when the page is stretched and shrunk

14. Document loading and rendering are performed from top to bottom, so the CSS selector does not select upward (brother elements, parent elements, ancestors Element)

15.color color attribute can be inherited

16.inherit will let the child element inherit the value of the parent element on the specified CSS attribute. If the parent element does not set this value, it will not To inherit this attribute value from ancestor elements (many attributes are not inherited by default, such as height, so you need to add inheritance to them to make them inherit)

17. Frame and body do not coexist, although iframe coexists with body. But there will be some problems (problems with website ranking and style rendering)

18. The values ​​in border-radius, filled pixels and filled percentages form different shapes. (50% will form a circle or ellipse, and 1/2height pixels will form a capsule)

19. The cells in a row do not set a height and have no content. If the table sets a height, it will not be allocated to it (still I am a good socialist!), if I want it to have a row height, just write  

20.td to set the width and height, and table to set the width and height, but give td padding (td does not support margin, but supports padding) will expand the table infinitely (if you only increase the width and height attributes of td, when the total width and height of td is equal to the width and height set by the table, further increase will Invalid, in fact, when the table width and height are greater than the actual width and height of td, the extra part will be allocated)

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