How can I change the font-size of a select option?
Add a CSS class to the <option>
tag to style it: http://jsfiddle.net/Ahreu/
Currently WebKit browsers don't support this behavior, as it's undefined by the spec. Take a look at this: How to style a select tag's option element?
We need a trick here...
Normal select-dropdown things won't accept styles. BUT. If there's a "size" parameter in the tag, almost any CSS will apply. With this in mind, I've created a fiddle that's practically equivalent to a normal select tag, plus the value can be edited manually like a ComboBox in visual languages (unless you put readonly in the input tag).
A simplified example:
<style>
/* only these 2 lines are truly required */
.stylish span {position:relative;}
.stylish select {position:absolute;left:0px;display:none}
/* now you can style the hell out of them */
.stylish input { ... }
.stylish select { ... }
.stylish option { ... }
.stylish optgroup { ... }
</style>
...
<div class="stylish">
<label> Choose your superhero: </label>
<span>
<input onclick="$(this).closest('div').find('select').slideToggle(110)">
<br>
<select size=15 onclick="$(this).hide().closest('div').find('input').val($(this).find('option:selected').text());">
<optgroup label="Fantasy"></optgroup>
<option value="gandalf">Gandalf</option>
<option value="harry">Harry Potter</option>
<option value="jon">Jon Snow</option>
<optgroup label="Comics"></optgroup>
<option value="tony">Tony Stark</option>
<option value="steve">Steven Rogers</option>
<option value="natasha">Natasha Romanova</option>
</select>
</span>
<!--
For the sake of simplicity, I used jQuery here.
Today it's easy to do the same without it, now
that we have querySelector(), closest(), etc.
-->
</div>
A live example:
https://jsfiddle.net/7ac9us70/1052/
Note 1: Sorry for the gradients & all fancy stuff, no they're not necessary, yes I'm showing off, I know, hashtag onlyhuman, hashtag notproud.
Note 2: Those <optgroup>
tags don't encapsulate the options belonging under them as they normally should; this is intentional. It's better for the styling (the well-mannered way would be a lot less stylable), and yes this is painless and works in every browser.