In this Hasty Treat, Scott and Wes conclude a three-part series about old browsers, fallbacks and polyfills. In part three, they talk specifically about transpiling and polyfilling.

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Show Notes

2:20 - Polyfills and Transpile

5:18 - Back in the day

Border-radius htc hack
PNG fix for transparent PNGs
Flash for custom fonts
Cufon and SIFR

10:48 - JavaScript Polyfills

13:47 - JavaScript Transpile

Syntax is transpiled
babel-preset-env
Babel has plugins and presets
Meteor bundle to different browsers on demand
There are polyfills for most things, but performance can be an issue
- Resize observer
- Intersection Observer
Some things can’t be done with either
- New browser APIs
- Service workers, device access, inline video on old iOS, etc.

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