Highlight label if checkbox is checked - html

Question

Is there a non-javascript way of changing the color of a label when the corresponding checkbox is checked?

Answer 1

Use the adjacent sibling combinator:
.check-with-label:checked + .label-for-check {
font-weight: bold;
}
<div>
<input type="checkbox" class="check-with-label" id="idinput" />
<label class="label-for-check" for="idinput">My Label</label>
</div>

Answer 2

I like Andrew's suggestion, and in fact the CSS rule only needs to be:
:checked + label {
font-weight: bold;
}
I like to rely on implicit association of the label and the input element, so I'd do something like this:
<label>
<input type="checkbox"/>
<span>Bah</span>
</label>
with CSS:
:checked + span {
font-weight: bold;
}
Example: http://jsfiddle.net/wrumsby/vyP7c/

Answer 3

This is an example of using the :checked pseudo-class to make forms more accessible. The :checked pseudo-class can be used with hidden inputs and their visible labels to build interactive widgets, such as image galleries. I created the snipped for the people that wanna test.
input[type=checkbox] + label {
color: #ccc;
font-style: italic;
}
input[type=checkbox]:checked + label {
color: #0964aa;
font-style: normal;
}
<input type="checkbox" id="cb_name" name="cb_name">
<label for="cb_name">CSS is Awesome</label>

Answer 4

You can't do this with CSS alone. Using jQuery you can do
HTML
<label id="lab">Checkbox</label>
<input id="check" type="checkbox" />
CSS
.highlight{
background:yellow;
}
jQuery
$('#check').click(function(){
$('#lab').toggleClass('highlight')
})
This will work in all browsers
Check working example at http://jsfiddle.net/LgADZ/