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【单选题】
To see the transition effect of animation, what attribute of the element must be specified? ( )
A.
transform
B.
transition
C.
perspective
D.
transform-origin
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参考解析：
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举一反三
【单选题】Which of the following statements about transform-origin is incorrect? ( )
A.
The element rotates around the center whentransform-origin is not specified.
B.
The transform-origin propertyallows you to change thetransform location of the element.
C.
To rotate around the z axis by setting transform-origin property, you must first set transform-style:preserve-3d.
D.
The transform-origin property can set not only rotation but also movement.
【单选题】Which of the following statements about animation property is incorrect? ( )
A.
The animation-duration can be omitted when defining animation.
B.
The animation-duration is used to specify the time taken to complete animation, measured in seconds or milliseconds.
C.
The default value of animation-duration property is 0, if animation-duration is not defined, the animation will not be played.
D.
The animation-iteration-count specifies the number of times the animation should be played.
【单选题】Which of the following statements aboutwebpage animation is incorrect? ( )
A.
To create animation in css3, you need to use the @keyframes rules.
B.
When creating an animation in @keyframes, you shouldn't bind it to a selector.
C.
When using @keyframes, specify the change time by percentage, or use keywords "from" and "to", which are equivalent to 0% and 100%.
D.
0% is the beginning of animation and 100% is the completion of animation.
【单选题】Which of the following statements about animation property is correct? ( )
A.
The animation-timing-function specifies the speed curve of animation, its default value is linear, which means that the speed of animation is the same from beginning to end.
B.
The animation-duration specifies the seconds or milliseconds it takes for animation to complete a cycle, its default value is 0.
C.
The animation-iteration-count specifies the number of times the animation is played, its default value is infinite, which means playing animation infinitely.
D.
The animation-delay defaults to 0, which means animation is paused.
【单选题】In css3, the ( ) attribute specifies the style to be applied to the element when the animation is not playing (when the animation is finished, or when the animation does not start playing with a dela...
A.
animation-direction
B.
animation-play-state
C.
animation-fill-mode
D.
animation-delay
【单选题】Now, a cube with a side length of 300px is rotated around the center of the cube. Which of the following statements is correct? ( )
A.
transform-origin:50% 50% 50%;
B.
transform-origin:50% 50% -50%;
C.
transform-origin:50% 50% 150px;
D.
transform-origin:50% 50% -150px;
【单选题】Which of the following attributes can sort flexible sub-elements? ( )
A.
flex
B.
order
C.
flex-grow
D.
flex-shrink
【单选题】Which of the following attributes can make the flex container display on multiple lines? ( )
A.
flex-wrap
B.
flex-flow
C.
flex
D.
flex-direction
【单选题】If you want to set the alignment of flexible sub-elements, which of the following statements is correct? ( )
A.
Set for flexible sub-elements justify-content: space-between
B.
Set for flexible element justify-content: space-between
C.
Set for flexible sub-elements align-content: space-between
D.
Set for flexible element align-content: space-between
【多选题】(Multiple-choice question) Which of the following items belong to display attribute values? ( )
A.
block
B.
inline
C.
table
D.
flex
E.
inline-flex