On the one hand, the deficiencies in that table don't look all too serious. Maybe Date.toJSON missing is the worst. On the other hand, that's a poor excuse -

On the one hand, the deficiencies in that table don't look all too serious. Maybe Date.toJSON missing is the worst. On the other hand, that's a poor excuse - why the heck haven't they fixed these issues? Cross browser compat is annoying enough as it is.