To specify an element's font size, use the CSS
Remember from our Fundamentals of Length lesson that we can use pts, px, %, em, or vw.
Use pts and px if you want to be exact, and use %, em, or vw to have your font be relative to another element. Additionally, we can use vw and vh for the size to be relative to the user's viewport window.
Text size should almost never be specified in pixels. Rather, we should use a relative unit (eg. em), to ensure proper contrast. Remember the magic formula:context / default = result
Type Scales are a set of ratio that was developed by European typographers in the 16th century. Rather than use font sizes that were all over the place, they decided to standardize specific sizes. Eventually they came up with a list of text sizes that were pleasing to the eye.
An example of this is the 12 pixel scale:
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