Answers for "how to target element in iframe css"

change element in iframe

// so you got an iframe (id="myiframe"). In that page you have an element id="theprice" and you want to change its value
// from the parent page do this in your javascript:
var iframevar = document.getElementById('myiframe');
var elmnt = iframevar.contentWindow.document.getElementById("theprice");
elmnt.innerHTML = theNewPrice;

change source of iframe attribute target

<a href="foo.html" target="myiframe">Foo</a>
<a href="bar.html" target="myiframe">Bar</a>
<a href="baz.html" target="myiframe">Baz</a>

<iframe name="myiframe"></iframe>