Why is it that a label tag cannot be placed directly above an input tag?

On this particular page:

http://getbootstrap.com/components/#input-groups-buttons

If you modify the Go! button to a label (using Chrome inspector), you will observe that the Go! button is no longer positioned on top of the input field:

https://i.sstatic.net/rqnto.png

(Instead, the borders are now next to each other rather than stacked.)

What might be causing this and how can you adjust the elements to stack on top of one another?

https://i.sstatic.net/BFGQt.png

Answer №1

When using Bootstrap, the label element is styled with a max-width:100%, which affects its border box due to the box-sizing:border-box property being applied across the board. This causes the label to fit within its parent span element by reducing its width by one pixel. The reason for this reduction is that the parent span element must accommodate the margin box of the Go! button/label, which has margin-right:-1px applied. Since the span is defined as the containing block for the button/label by the input-group-btn class (making it display:table-cell), this arrangement allows for proper alignment.

To achieve the same results without the constraints of max-width, simply override it with label { max-width:none; }. For more targeted styling, consider using a more specific selector in your CSS rules.

Answer №2

Placing a label above an input field may not be the most effective approach; separating them and positioning them adjacent to each other could yield better results. A useful discussion addressing this issue can be found here. Additionally, adjusting the z-index in the style section of each div could also solve this problem. As for providing a definitive explanation for why this occurs, I am not entirely certain...

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