Change the size of text in your Tumblr posts by using HTML tags. You can change the size of the entire post or just certain portions of the post, and you can make the text larger or smaller.

Text in HTML documents can be rendered at a wide range of sizes. Text size is affected by multiple factors including browser default styles, styles added by the HTML document, browser settings ...

Text size in HTML documents can be affected by multiple factors including browser default styles, styles added by the HTML document and, if the code allows it, browser settings and user style sheets.

How to Make the Text Size Larger on Facebook. If you're logging on to Facebook from your place of business, you've got to keep one eye on your boss or employees lest they notice you browsing ...