The difference between width:100%; and width:auto

This time I will bring you the difference between width:100%; and width:auto. What are the precautions when using width:100%; and width:auto? The following is a practical case. Get up and take a look.

<p>
    <p>1111</p>
</p>
p{
　　width:980px;<br>　　background-color: #ccc;<br>　　height：300px;
}
p{
     width:100%;<br>　　/*width:auto;*/
    padding:10px;<br>　　background-color:#000;<br>
}

If the width of p is: 100%, it means that the width of p will be 980px, which will fill the p area, and then it has padding, so it will exceed p.

And when width:auto, it is the overall width (including width, margin, padding, border) equal to the parent width (width, excluding the parent's margin, padding, border) , so if padding already takes up 10px of space on the left and right, then the value given by width is 960px.

But whether it is width:100% or auto, the calculation reference is the parent content area width value, not the total width value.

I believe you have mastered it after reading the case in this article Method, for more exciting information, please pay attention to other related articles on the php Chinese website!

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