[Bug 19558] New: Needed: An Algorithmic "Hook" For Culling URL.objectURLs with autoRevoke=true

https://www.w3.org/Bugs/Public/show_bug.cgi?id=19558

          Priority: P2
            Bug ID: 19558
                CC: arun@mozilla.com, ian@hixie.ch, mike@w3.org,
                    public-html-wg-issue-tracking@w3.org,
                    public-html@w3.org
          Assignee: erika.doyle@microsoft.com
           Summary: Needed: An Algorithmic "Hook" For Culling
                    URL.objectURLs with autoRevoke=true
        QA Contact: public-html-bugzilla@w3.org
          Severity: normal
    Classification: Unclassified
                OS: other
          Reporter: eoconnor@apple.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: HTML5 spec
        Depends on: 19554
           Product: HTML WG

+++ This bug was initially created as a clone of Bug #19554 +++

Currently, URL.createObjectURL is specified to work with autoRevoke set to
true, which allows Blob URLs to be valid past a provided stable state.

But stable state is not a sufficient concept, nor is the misdirected Bug 17988
which seeks to have microtask defined as a concept.

What is needed here is: something that's always invoked when exiting the
outermost script (including from parser-invoked script) .  If this is provided
in HTML5, we can use it to describe autoRevoke semantics.  This is useful for
the createObjectURL default pattern, which avoids persisting string-based
references to in-memory objects, minimizing leaks.

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