I knew iframe in another document is not applicable for parent over-riding (due to same domain policy), but, the src JS execution happens only in the parent. So, how do I over-ride alert () which is applicable to above iframe tag?

As a hack for this, just make a new page containing full page frame to where your iframe is; and add the javascript in to the page. And you're correct, but elements in the page are derived as subclasses from the document class, so my statement is also correct but in an abstract way.

The use of <iframe> with <button> to switch between web pages causes loss of font styles on both the home page and embedded page.

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I’m making a Rich Text Editor, like this one here, and I have a problem. I’m using an IFRAME, and the default font is Times New Roman. I want to change it to Verdana on the page load, but I ...

Copied from https://github.com/pgaijin66/XSS-Payloads

Description The alert() method displays an alert box with a message and an OK button. The alert() method is used when you want information to come through to the user.

To understand this story better, please check out the following stories. “100 XSS Payloads” is published by vic.

A list of useful payloads and bypass for Web Application Security and Pentest/CTF - PayloadsAllTheThings/XSS Injection/Intruders/xss_alert_identifiable.txt at master ...

I would like to know if the src attribute of an iframe is safe for user input ? I found this question, but my doubt is that I tried the code provided in the answer and it doesn't do anything with the sandbox="allow-scripts allow-same-origin" attribute.