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Which attribute is not essential under <iframe>?

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Which attribute is not essential under <iframe>?

(a) src

(b) height

(c) width

(d) frameborder

This question was posed to me by my college professor while I was bunking the class.

I need to ask this question from HTML5: Beyond Markup in portion HTML Markup, Forms, Video, Audio & Other Multimedia of HTML

1 Answer

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Best answer
Correct option is (d) frameborder

To elaborate: An iframe is equivalent to a window that has been cut into our page, it is created using <iframe> element. Src, height, width attribute are essentially used inside of this. Src attribute specifies the URL of the page which is to be shown. Height and width specify the height and width of an iframe in pixels.

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