How can I add a variable that change the font sizes in a tumblr theme?
HTML
<meta name="size:Whateveriwant" content:"">
CSS
font-size: {size:Whateveriwant};
I know you can use option types such as color, text, image, boolean, but can you make your own, such as size?
As mentioned in the comments, you can't create a custom theme option, such as size.
However, it is possible to do something similar. Use the text theme option, which acts like a string.
HTML
<meta name="text:Whateveriwant" content:"16px">
CSS
font-size: {text:Whateveriwant};
Rendered CSS
font-size: 16px;