What does the CSS property flex-wrap: nowrap do in a flex container?

Question

BlackTom AI · Accepted Answer

Starting with a broad view, the question targets the behavior of the CSS flex-wrap property in a flex container. 
Option 1: 'It allows flex items to wrap onto multiple lines when needed' — this describes flex-wrap: wrap (or wrap-reverse for reverse wrapping) rather than nowrap. So, this option misstates the wrapping capability. 
Option 2: 'It prevents flex items from wrapping, forcing them into a single line' — this accurately describes flex-wrap: nowrap, which keeps all flex items on a single line and can cause overflow if there's not enough space. 
Option 3: 'It centres all flex items vertically' — vertical centering is controlled by align-items or align-content, not by flex-wrap. Therefore, this is incorrect in the context of what flex-wrap does. 
Option 4: 'It reverses the order of the flex items' — reversing order is a behavior related to the flex-direction property (or writing-mode), not flex-wrap. Thus this option is not correct.

In summary, the only statement that matches the effect of flex-wrap: nowrap is that it prevents wrapping and keeps items on a single line, potentially overflowing the container if space runs out. The other options describe features governed by other flexbox properties and do not reflect the function of nowrap.

What does the CSS property flex-wrap: nowrap do in a flex container? 单项选择题

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