It is easy to use too many font sizes on a website.
Especially when using em
font sizes as these are relative to their parent.
I wanted an easy way to see the number of font sizes used on a website.
I created this JavaScript bookmarklet.
![](https://www.nathankowald.com/blog/wp-content/uploads/2019/05/font-size-detective.jpg)
To use:
1. Add a new bookmark in your browser
2. Paste the below code into the URL
3. Go to a website and click the bookmark link
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