Going forward, instead of enabling a feature by default with a vendor prefix, we will instead keep the (unprefixed) feature behind the “enable experimental web

Going forward, instead of enabling a feature by default with a vendor prefix, we will instead keep the (unprefixed) feature behind the “enable experimental web platform features” flag in about:flags until the feature is ready to be enabled by default. For the feature's we're talking about (JS methods and CSS stuff), doing so will mean that effectively no web authors use it. It's no different than requiring a plugin to view content. Anything hidden behind a feature flag might as well not exist, at least for those two categories. For dev tools, stuff like that? Sure, feature flags are the way to go.