I have a massive tool. In fact I have lots of them. That just sounds wrong. Anyway, I'm going to list ones I've found handy.
Local CSS Dev
- Edit and persist changes to your code using Devtools workspace
So we want an image 250px by 250px for testing. There are some cool resources out there. Check out 8 of the top 10 placeholders if you don't like the ones below.
Jshint was good for a while, but now we use eslint.
Draw.io is an awesome system design tool.
These one liners are essential, runing a python server on one line plus many more.
Cross Browser Testing
A complete list of MIME types