How to creating a tab that target an iframe?

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Javascript

I'm not used to javascript. What I want to do is simple.

Let's say I have <div> in my document and I want to create a new <a> tag/control inside it when I click on a button. When I click the button again it will create another <a> tag/control beside it without any spaces in between and when I click on the other button it will remove a particular <a> tag/control.

In other words a I want to create my own tab and target IFRAME when one of the <a> tag/control is click. I want to create it in pure javascript.

Please help me with this. Thank you.