What specific measurement does a font-size in pixels correspond to?

Many software programs and systems allow users to specify font size using pixel height, such as Photoshop and CSS.

But what does this measurement actually refer to? Is it the distance from the descender to the ascender? Or perhaps from the baseline to the cap height? I'm unsure if there is a universal standard for this, or if each application interprets it differently.

// UPDATE

I've come to realize that this might not be the appropriate place to inquire about this. Is there a way to delete or retract this question?

Answer №1

The solution is actually 'descender to the ascender' (approximately), however, each font behaves differently and has unique rendering in various programs and browsers. Therefore, if you are using a font that is not standard but slightly smaller than average, it may appear smaller than the pixel size specified with font-size attribute. Conversely, there are variations.

For example, when I examined my Image (magnified in Photoshop), it was Arial at font-size:18px; yet from bottom to top it measured 17px. This demonstrates that accuracy can vary depending on the font type and the platform or program being used.

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