onreadystatechange test page

Clicking start will schedule two self-restarting functions:

• runSetTimeout uses setTimeout(fn, 0) for queueing itself
• runOnReadyStateChange uses onreadystatechange for queueing itself

Results:

• In IE10 Mobile, runSetTimeout and runOnReadyStateChange are called alternately
• In IE10 Desktop, runOnReadyStateChange is called repeatedly, runSetTimeout is never called (and the browser jams within a few seconds)