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If in the code below the font was monospace and each character was 10px wide, the output would be 330px, the font size and type interfere with this value.
<textarea>fonte monospace com 33 caracteres</textarea>
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– Bruno Warmling
I can’t put a span tag inside a textarea tag. If you put the textarea inside the span tag it will take the width of the input and not only the text.
– Vinícius Macedo
Is that a question or a statement? Remember that in Portuguese (and several other languages), a question ends with the sign of "?".
– Sam
See if it helps https://developer.mozilla.org/en-US/docs/Web/API/Element/getBoundingClientRect
– Augusto Vasques