Move logic for judging whether a page float is allowed on the current context so that the logic can be overridden by subclasses
Move logic for judging whether a page float is allowed on the current context so that the logic can be overridden by subclasses

vivliostyle/vivliostyle.js,vivliostyle/vivliostyle.js,vivliostyle/vivliostyle.js,vivliostyle/vivliostyle.js