How do you develop sites targeting IE in 2019?

Question

For various reasons, I have to support IE (11) in my work on a large React/Redux/Bootstrap app, using fairly standard Babel transpiration and polyfills.I&rsquo;m interested to hear how others in similar situations manage this problem - questions like:Do you develop IE-first or have it as part of a testing checklist?What have you learned about performance optimization for the IE VM?Are there alternatives to the very slow F12 devtools?And any other tips you&rsquo;ve collected while supporting the browser.

Porthos9K · Accepted Answer

IE11? You lucky stiff. I'm still supporting IE6 (and getting hazard pay for it). I do it with lots of progressive enhancement, handwritten JS, profanity, and monthly pub crawls. By default the apps I build don't even do AJAX; the baseline is HTTP GET and POST to a REST API with full-page refreshes.