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【单选题】
Which of the following statements about id selector is incorrect? ( )
A.
The syntax format of id selector is "#id name".
B.
If you want to use the id selector, you should first define an id attribute value for the element, such as: <div id="a"></div>.
C.
# selector is more suitable for defining class styles.
D.
An id name can only correspond to a specific element object of a document.
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参考答案：
举一反三
【多选题】What are the correct statements about link and import? ( )
A.
Import styles are used in the <head> tag as follows: <style>@import url("");</style>.
B.
When the page is loaded, the CSS referenced by link will not be loaded at the same time.
C.
CSS referenced by @import will not be loaded until all pages are downloaded.
D.
Pages that refer to CSS in the way of @import will appear unstyled flicker when loading.
【单选题】Which of the following statements about floating is wrong? ( )
A.
The floating of elements is horizontal, which means that elements can only move left and right, but not up and down.
B.
Floating is very useful in web page layout.
C.
Elements before floating element will also be affected.
D.
The text element after the floating element will surround it.
【单选题】Which statement about style priority is incorrect? ( )
A.
Css styles directly defined on tags have the highest level.
B.
Internal styles have lower priority than inline styles.
C.
External style sheets have the lowest level.
D.
When the attributes in the style conflict, the preset comes into effect.
【单选题】The round dot before the unordered list item <li> can be removed by ( ) .
A.
clear:both;
B.
font-style:none;
C.
list-style:none;
D.
list-style:normal;
【多选题】(Multiple-choice question) In css, what are the common methods to clear floating? ( )
A.
Add an empty block element afterthefloating element.
B.
Add an empty line element after the floating element.
C.
Set the height of the parent element of the floating element.
D.
Set to clear floating by means of pseudo class.
E.
Set floating for parent elementof the floating element.
【多选题】(Multiple-choice question)Which options are right about floating element characteristics?
A.
Floating element is separated from the document flow.
B.
The float:top willset the element to float upwards.
C.
After the line element is set to float, the line element will automatically turn into a block element.
D.
Floating elements can not hold up the block that contains it.
相关题目：
【多选题】What are the correct statements about link and import? ( )
A.
Import styles are used in the <head> tag as follows: <style>@import url("");</style>.
B.
When the page is loaded, the CSS referenced by link will not be loaded at the same time.
C.
CSS referenced by @import will not be loaded until all pages are downloaded.
D.
Pages that refer to CSS in the way of @import will appear unstyled flicker when loading.
【单选题】Which of the following statements about floating is wrong? ( )
A.
The floating of elements is horizontal, which means that elements can only move left and right, but not up and down.
B.
Floating is very useful in web page layout.
C.
Elements before floating element will also be affected.
D.
The text element after the floating element will surround it.
【单选题】Which statement about style priority is incorrect? ( )
A.
Css styles directly defined on tags have the highest level.
B.
Internal styles have lower priority than inline styles.
C.
External style sheets have the lowest level.
D.
When the attributes in the style conflict, the preset comes into effect.
【单选题】The round dot before the unordered list item <li> can be removed by ( ) .
A.
clear:both;
B.
font-style:none;
C.
list-style:none;
D.
list-style:normal;
【多选题】(Multiple-choice question) In css, what are the common methods to clear floating? ( )
A.
Add an empty block element afterthefloating element.
B.
Add an empty line element after the floating element.
C.
Set the height of the parent element of the floating element.
D.
Set to clear floating by means of pseudo class.
E.
Set floating for parent elementof the floating element.
【多选题】(Multiple-choice question)Which options are right about floating element characteristics?
A.
Floating element is separated from the document flow.
B.
The float:top willset the element to float upwards.
C.
After the line element is set to float, the line element will automatically turn into a block element.
D.
Floating elements can not hold up the block that contains it.
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