Text Box Watermark

Hi! I'm trying make my own extension. I'm new on Linux and JavaScript. Now, there is a text box on the panel. I want add a watermark on this text box. I can't find any guide for this. How can I add watermark? There is a watermark example:
editing-textbox-using-background-image

Photo source: How to: Add a Watermark to a TextBox - WPF .NET Framework | Microsoft Learn

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I don't know the answer to your question, but I believe you will have more success in your searches if you search for "placeholder".

Try to search for "input text placeholder" , "input box placeholder".

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