add principle on forwards compatibility / graceful degradation (HTML Design Principle 2.2)

w3ctag / design-principles

A small-but-growing set of design principles collected by the TAG while reviewing specifications

https://w3ctag.github.io/design-principles

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Open dbaron opened 4 years ago

dbaron commented 4 years ago

The HTML design principles has a section 2.2. Degrade Gracefully about how new features should behave as well as possible in implementations that predate them.. As a followup to https://github.com/w3ctag/design-principles/issues/126#issuecomment-610117172 @fantasai's blog post has a different take on both this and backwards compatibility (#174).

hober commented 4 years ago

Part of #160.