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 issue in Safari and Chrome where this loads a duplicate copy of my page within the iframe.
I read about "about:blank" in another question, however I've read that IE9 sends a null request to the server when you use this as the src. I've also yet to find anything listing this src as standards compliant.
Does anyone have an alternative to "about:blank" that they use to create an empty iframe?
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.
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.".
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
