docs: Ammend the lazy pseudo-element section to be clearer

Thanks to Simon for the feedback :)
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Emilio Cobos Álvarez 2016-05-03 23:38:55 +02:00
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@ -118,8 +118,8 @@ Lazy cascading allows to compute pseudo-element styles lazily, that is, just
when needed.
Currently (for Servo, not that much for stylo), **selectors supported for this
kind of pseudo-elements are only a subset of selectors that can be computed
in a thread-safe way in layout**.
kind of pseudo-elements are only a subset of selectors that can be matched on
the layout tree, which does not hold all data from the DOM tree**.
This subset includes tags and attribute selectors, enough for making
`::-servo-details-summary` a lazy pseudo-element (that only needs to know