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This works great until browser vendors that aren't whitelisted but support the features of a whitelisted browser (e.g. Chromium derivatives) realize that they'r

• runarberg 7y ago
  It is better to get the feature along with a bigger bundle then not get the feature at all even though your browser supports it. Note the parent is claiming that feature detection is not feasible for a site like YouTube because of the extra cost. Here I show how you can still bundle optimally for whitelisted (i.e. QA-ed) user-agents while still not blocking non whitelisted user-agents from accessing these features, and still not brake the page for user-agents that don’t support it.