feat: update viewport meta element requirements #1460
Merged
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Update viewport checks
This PR implements the post-CR changes on the requirements for the
viewport meta element used to define the ICB in fixed-layout documents.
Viewport syntax:
ViewportMeta
object now return a list of string values when looking up values for a name.ICB definition checks:
viewport
meta
element of fixed-layout documents is checkedHTM-059
error is reported whenheight
orwidth
dimensions are specified more than onceHTM-060a
usage is reported for any subsequentviewport
meta
element found in fixed-layout documentsHTM-060b
usage is reported fo anyviewport
meta
element found in reflowable documentsFix #1401, Fix #1449
Other changes