Open Bug 576159 Opened 12 years ago Updated 12 years ago

Consider flagging prescontexts that have media queries that depend on parent document

Categories

(Core :: CSS Parsing and Computation, defect)

Product:
Core
Component:
CSS Parsing and Computation
Platform:
x86
macOS
Type:
defect
Priority:
Not set
Severity:
normal

Tracking

()

People

(Reporter: bzbarsky, Unassigned)

References

(Blocks 1 open bug)

Details

(Keywords: perf) 

We convert style flushes on a document into layout flushes on the parent, just in case the document has media queries that depend on the viewport size.  But most documents don't, right?  Is it worth flagging the prescontext (during media query matching) if the media query depends on the viewport size, and then conditioning the promotion to Flush_Layout on that flag?
Blocks: domperf
Keywords: perf
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