Create an iframe with an empty src that's a standards compliant alternative to “#”

Question

I have an iframe on a page that I need to initially have a blank src for, as I eventually set the src with javascript.

I had been using a however have encountered an is

Answer 1

about:blank is the way to do it. Alternately, you could just insert the whole <iframe> element with JavaScript later, and don't worry about a valid "empty" src.

Answer 2

As part of the about URI scheme standard, about:blank is probably the best option as it has very good browser support.

about:blank Returns a blank HTML document with the media type text/html and character encoding UTF-8. This is widely used to load blank pages into browsing contexts, such as iframes within HTML, which may then be modified by scripts. You can see further here

Answer 3

One of the linkers in Google Web Toolkit contains a dynamically created iframe. They use javascript:'' as a temporary placeholder for the src attribute. The reason, according to the source comments, is "Prevents mixed mode security in IE6/7.".

Source.