This is the standard Nokia Browser for Symbian phones with an Software version of 51.0.002.
The HTML5 test site scores the browser as 94 (as at the 31st of March 2012) out of 475. The HTML5 standard is still evolving so the score may change with time.
Okay so we have a score, which is good for comparisons, but what does it really mean for developers and users.
The details are here.
Some of the features I find important are:
Canvas 20/20.
It understands the canvas element and 2D and Text drawing.
User Interaction 0/36.
Drag and Drop – No.
Web Apps 4/20.
Application Cache – No.
Communication 9/36.
XMLHttpRequest – Partial.
Storage 0/20.
Local Storage – No.
Workers 0/15.
Web Workers – No.
All up it is a bit disappointing but one can work around some of the shortfalls.
Nokia has its own version of local storage that can be tested for and used (leaving us still doing browser specific checks in HTML5, for now).