I've looked high and low for an answer to this, and I've come to ask for clarification.

I am using escape('html_attr') filter for something like, <div data-stuff="{{ thing|escape('html_attr') }}" >. When escaping large strings, this suffers from poor performance.

The best reasons I can find for using html_attr instead of html is:

1. If you are not using quotes " to enclose your attribute (e.g. <div data-stuff=example>), then html_attr will work well because it will properly escapes spaces etc. I believe most people avoid this method because, well, it's ugly and horrible. But regardless, browsers do support it.
2. If you are using old versions of IE, it will consider a tick mark ` to terminate the attribute, and html_attr will escape the ticks, avoiding this (e.g. it won't run into the problem of <div data-stuff="example`example">, which would cause <div data-stuff="example" example> in old IE)

Can you give me an example of a string which would give undesired outcome if escaped using only the default escape('html'), besides the above two scenarios? Thank you for your time.