Respect size attribute for form fields

[andypillip]

It’s usability best practice to size form fields according to the expected input. It helps users gather without reading what is expected.

Example:

<label>Postcode
   <input type="text" inputmode="numeric" size="6">
</label>

Currently, all inputs are full width.

It would be nice if the presence of a size attribute would be respected by the styles.

This could be achieved like so:

input:not([size]) {
  width: 100%
}

Checkboxes etc. are already excluded, it would suffice to add [size] to the list of exceptions, but I guess it would need some display: block as well, as the size currently is the only means used to keep the input in its own line.

[lucaslarroche]

@andypillip great idea. I like it.
Would you like to open a PR?