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I feel like these quotation marks are useless. I removed the quotation marks and it still works. Is there any other place where I must use these quotation marks in the future?

update time：2017-08-13 15:41:18
1608Page View2 answers

Descendant selectors vs. element selectors

update time：2019-11-15 10:59:05
1598Page View1 answers

Class styles of the same level have higher priority. What does this mean?

update time：2019-09-19 19:40:46
1589Page View1 answers

type="text/css"是什么意思？

update time：2016-12-22 09:47:49
1586Page View2 answers

li和ul是否都需要display：inline？

update time：2016-12-21 11:41:17
1586Page View1 answers

After multiple pictures are automatically wrapped, the pictures are displayed in the center.

update time：2019-03-07 11:37:05
1584Page View5 answers

What is the difference between left and margin-left in this?

update time：2018-07-04 14:09:38
1575Page View1 answers

Hello teacher, please help. I made an error when selecting the version and color. When I select the second one, the default option color does not return to the original color.

update time：2019-01-07 18:04:43
1572Page View4 answers

How did this ruler appear?

update time：2018-05-12 10:37:30
1564Page View1 answers

The fairy sister said it so well! ! !

update time：2018-05-16 00:43:30
1560Page View3 answers

Closing CMD will stop refreshing!

update time：2019-04-27 21:08:25
1556Page View1 answers

Actual layout (1) cannot display pictures

update time：2018-12-10 19:02:36
1554Page View1 answers

Create a div, clear: both. What's the meaning?

update time：2018-05-15 17:50:46
1523Page View1 answers

请问我们在做网站的时候，应该使用哪一种方式呢

update time：2016-12-19 14:44:57
1520Page View1 answers

css inline style style

update time：2019-03-07 08:54:47
1516Page View4 answers