You can use an iframe to display a preview of the page on mouseover:
.box{_x000D_
display: none;_x000D_
width: 100%;_x000D_
}_x000D_
_x000D_
a:hover + .box,.box:hover{_x000D_
display: block;_x000D_
position: relative;_x000D_
z-index: 100;_x000D_
}
_x000D_
This live preview for <a href="https://en.wikipedia.org/">Wikipedia</a>_x000D_
<div class="box">_x000D_
<iframe src="https://en.wikipedia.org/" width = "500px" height = "500px">_x000D_
</iframe>_x000D_
</div> _x000D_
remains open on mouseover.
_x000D_
Here's an example with multiple live previews:
.box{_x000D_
display: none;_x000D_
width: 100%;_x000D_
}_x000D_
_x000D_
a:hover + .box,.box:hover{_x000D_
display: block;_x000D_
position: relative;_x000D_
z-index: 100;_x000D_
}
_x000D_
Live previews for <a href="https://en.wikipedia.org/">Wikipedia</a>_x000D_
<div class="box">_x000D_
<iframe src="https://en.wikipedia.org/" width = "500px" height = "500px">_x000D_
</iframe>_x000D_
</div> _x000D_
and <a href="https://www.jquery.com/">JQuery</a>_x000D_
<div class="box">_x000D_
<iframe src="https://www.jquery.com/" width = "500px" height = "500px">_x000D_
</iframe>_x000D_
</div> _x000D_
will appear when these links are moused over.
_x000D_