I just downloaded heatmap.js but it doesn't work on my computer
Are you running it on a local webserver? This is required so canvas manipulation can be done. Read more about how to setup heatmap.js here
What browsers support heatmap.js?
IE9+, Firefox 3.6+, Chrome 11+, Opera, Safari.
How many datapoints can heatmap.js handle?
What happened to heatmap.js v1?
heatmap.js v1 support has been discontinued. Please update your version to heatmap.js v2, it's way better/faster. Here is a document about the major changes you'd have to do to migrate to v2. If you need v1 nevertheless you can get it from here
I want to contribute. How?
That's awesome, thank you! You can find the repository on github. Please read the contribution guidelines first before you create a pull request.