How does CSS implement vertical text la S and css implements vertical text la s?

How does CSS implement vertical text la S and css implements vertical text la s?

How CSS achieves vertical text la s:
Although text vertical bars are not commonly used, they do not have such requirements, but the existing CSS attribute support is not high or the compatibility is not good, and no proper method is found to achieve this effect, the following is an example of the effect implemented using javascript. You can use it for reference. The effect is very good. The code example is as follows:

<! DOCTYPE html> 
The above code perfectly achieves the desired effect and can be applied directly. If you are grateful for your interest, you can analyze the code yourself.
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