Javascript Beautifier

http://jsbeautifier.org

XML Beautifier

http://xmlbeautifier.com/

Javascript: cross-browwser load content in iFrames

The most general, cross-browser, method of navigating any frame
(including an IFRAME) with scripts is to arrange that the frame has
both ID and NAME attributes that hold the same value and then access
its window/frame object through the – frames – collection of the
containing window/frame object, using that NAME/ID i.e.:-

window.frames['exampleFrameName'].location = 'new URL';

JavaScript Snippets

Edit/add inline content

document.getElementById("id").innerText = "value";

document.getElementById("id").innerHTML = "value";

document.getElementById("id").appendChild( newChild );