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

• Features are polyfilled
• MDN Polyfill
• Core-js
• Polyfill.io
• HTML5 Cross Browser 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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