HTML

how to open a website inside a website

<iframe src="https://www.codegrepper.com" width="100%" height="300px"
        title="website" style="border: 10px solid black;">
</iframe>

open a website within a website

javascript
$("#button").click(function () { 
      $("#iframe").attr("src", "http://www.google.com/");
});
html
<iframe id="iframe" src="" width="100%" height="400"></iframe><button id="button">Load</button>