fix(sce) IE 7 standards mode not supported

[justinrknowles]

Changed documentMode test from 8 to 7 to support IE 8 in IE 7 standards mode while still protecting against quirks mode. documentMode returns the following values: 5 - quirks mode, 7 - IE 7 standards mode, 8 - IE 8 standards mode. Closes #3633.

[IgorMinar]

cc: @chirayuk - just fyi

[chirayuk]

I just saw this now.

IE8 supports CSS expressions in both quirks and IE7 compatibility mode.  It's only in IE8 standards mode that IE8 disallows CSS expressions.

If IE7 must be supported, it should probably be via an explicit configuration setting than by default as done in this commit.

[justinrknowles]

I think one could argue that a user is supplying an explicit configuration with IE8 in IE7 standards mode as supply nothing results in quirks mode (5) where as 7 is only returned when the app supplies the following meta tag <meta http-equiv="X-UA-Compatible" content="IE=7">. That being said, I think it's great that the option can be disabled when configuring your module so I can solve my issue without modifying angular core without #3633 being merged.

[chirayuk]

@justinrknowles

I wanted IE8 standards mode at the minimum for $sce.  (IE7 standards mode isn't good enough.)  I've reverted 637c9b1

To disable $sce completely in order to support IE7, you can use code like this:

angular.module('ie7support', []).config(function($sceProvider) {
  // Completely disable SCE to support IE7.
  $sceProvider.enabled(false);
});