Click on the button to copy the text from the text field. Try to paste the text (e.g. ctrl+v) afterwards in a different window, to see the effect.

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CREAR LI

numero:

Introduce el número de LI

The document.execCommand() method is not supported in IE8 and earlier.

https://www.htmlquick.com/es/
https://www.codegrepper.com/code-examples/javascript/check+if+checkbox+is+checked+javascript https://www.whatsmyip.org/html-characters/