Re: [w3c/FileAPI] Blob URL store partitioning (#153)

Firefox has introduced an ancestor bit to the partition key implementation, and I believe it applies to Blob URL partitioning as well. Enforcing `noopener` on window.opened blob URLs when the opening page's top-level site is cross-site to the blob URL site sounds like a good idea, but we haven't implemented this behavior.

We are interested in aligning behavior across browser engines to avoid compatibility issues. So, defining a standard for Blob URL partitioning is probably the right approach.

CC @bvandersloot-mozilla


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