18741 2012-08-30 09:33:26 +0000 Somewhere the anti-looping behaviour should be specified since this works interoperably across browsers and seems to be a compat requirement for the web. It seems that if the iframe src resolves to a url of an ancestor browsing context, excluding the frag 2012-12-01 21:56:35 +0000 1 1 1 Unclassified WHATWG HTML unspecified Other other RESOLVED FIXED http://www.whatwg.org/specs/web-apps/current-work/#process-the-iframe-attributes P3 normal Unsorted 1 contributor ian ian james mike contributor oldest_to_newest 73057 0 contributor 2012-08-30 09:33:26 +0000 Specification: http://www.whatwg.org/specs/web-apps/current-work/ Multipage: http://www.whatwg.org/C#process-the-iframe-attributes Complete: http://www.whatwg.org/c#process-the-iframe-attributes Comment: Somewhere the anti-looping behaviour should be specified since this works interoperably across browsers and seems to be a compat requirement for the web. It seems that if the iframe src resolves to a url of an ancestor browsing context, excluding the fragment component, then nothing should load in the iframe. Posted from: 2001:4c28:a030:30:1d3c:929e:c265:c87b User agent: Opera/9.80 (X11; Linux x86_64; U; Edition Next; en) Presto/2.11.310 Version/12.50 73062 1 james 2012-08-30 13:19:14 +0000 OK, not quite perfect interoperability, but [1] seems to be close to the desired behaviour [1] http://hoppipolla.co.uk/tests/iframe/nested_iframes.html 74085 2 ian 2012-09-19 19:57:54 +0000 This doesn't seem accurate, I've definitely seen cases of deeper loops when hacking <iframe>s in the live DOM viewer. 79232 3 ian 2012-12-01 21:54:43 +0000 I don't follow what's going on in [1]. However, in my own testing I agree that Opera and Firefox do what you describe. WebKit seems to allow one extra iteration. I can't run IE on this machine. 79233 4 contributor 2012-12-01 21:56:35 +0000 Checked in as WHATWG revision r7555. Check-in comment: Browsers won't let you nest iframes that point to ancestors. http://html5.org/tools/web-apps-tracker?from=7554&to=7555