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Maybe the experts can explain to a normal homepage hobbyist what the advantages of em, rem, %, vw and vh are over px. I keep coming across posts about it, but I don't understand the benefits for me and my websites.

Is this just "a dispute over the emperor's beard" (German saying*)?

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*Discussion, debate (usually held in public) that is perceived as irrelevant, absurd; petty, exaggerated conflict over something meaningless, unimportant

Everything can be done with simple code, but since websiteX5 is an easy software even for those who DO NOT know how to program and do NOT know code, we try to respect the wishes of those who have advertised it as such for years.

https://elementor.com/help/whats-the-difference-between-px-em-rem-vw-and-vh/

https://woofrance.fr/tuto-elementor/trucs-et-astuces/quelle-est-la-difference-entre-px-em-rem-vw-et-vh/

----- Translated with google -----

According to this article - "Pixels are an absolute unit. This means that a heading that has the font-size 20px will always be exactly that size, namely 20 pixels. No matter what happens around it.
You can only tell how big a heading that is given in 2.5em is if you know what environment it is in. Because the unit em refers to the next higher container.

>> https://die-netzialisten.de/em-und-rem-was-ist-der-unterschied/ (German)

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That means it gets more complicated, because WebSite X5 would have to calculate which font size is specified in the container(s) above in order to display the font in the correct size in the text object so that the user knows how big the font will be on the website - Am I seeing that correctly?

I think this part is done directly by the browser ... Just WSX5 publishes the code and the browser does the interpretation of code.