How does roblox work out the amount of pixels a username takes up in the chat?

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1

I want to know how roblox works out the amount of pixels the name takes up.
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When sending a message, the chat places multiple whitespace characters before hand
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I’ve assumed already that the characters are mapped out manually and are indiviually checked, if that is the case can someone direct me to where I can find these? If not can someone then explain how

2

This function returns text size in pixels so it may help

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