[Klonoar]

>Not testing in more than one is lazy, standards ignorant and an insult to your users.

Slack et al are more successful with users, and have delivered more value to them, than 99% of the work people who post here are doing. Pretty sure this isn't insulting them.

And for the last time, this isn't the MSIE-fiasco all over again. The primary engines used today are all open sourced, it's not vendor lock in on the level it used to be.