Forbid `<a>` within `<label>`

[robsonsobral]

From MDN docs:

Interactive content

Don't place interactive elements such as anchors or buttons inside a label. Doing so makes it difficult for people to activate the form input associated with the label.

label a,
label button {
    @extend %warning;

    @include alert {
        content: 'do not place interactive elements such as `<anchors>` or `<buttons>` inside a label' !important;
    }
}