how to add inside a text box?

. I usually do it element.value="<script>alert('test');</script>".

If sounds like you are generating an inline <script> element, in which case the </script> will end the HTML element and cause the script to terminate in the middle of the string.

Escape the / so that it isn’t treated as an end tag by the HTML parser:

element.value = "<script>alert('test');<\/script>"

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