javascript or php+html form

I know how to make a html form with text box and submit button. But how do i get it to display the stuff from the text box on a another tab as html(the stuff in the text box is held with html page script) page,like the the w3school's "try it yourself" but pops into another tab.

You can do that with JS, which is probably safer.

You can save a reference to a window that you open.

Code:


var new_window = window.open(window properties etc);
new_window.document.write(textbox value);


Sorry that's a bit of a shortened version, i'm in a rush.
But look into window.open method, it allows you to open another window and manipulate it, eg adding html to it from a textbox