background-attachmen and background-size are used together why the picture is not fully displayed
background-attachmen and background-size are used together why the picture is not fully displayed
paste the complete code with the effect
if you must add width,height to the picture in this way, ordinary elements will not automatically calculate the length and width
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A timing examination system is triggered if the click event is triggered within 5 seconds, and if it is not triggered, the system marks the correct answer at the end of the countdown. How to implement ...
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