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The page http://docs.webplatform.org/wiki/html ends abruptly and contains a ! with this mouseover warning: "html" is not in the list of possible values (Animation, CSS Layout, CSS Font, Background, Border, Box Model, CSS Attributes, CSSOM, Combinators, Deprecated, Exclusions, Flexbox, Fonts, Generated and Replaced Content, Gradients, Grid Layout, Media Queries, Multi-Column, Paged Media, Pseudo-Classes, Pseudo-Elements, Regions, Ruby, Scrollbar, Selectors, Syntax, Tables, Text, Touch, Transforms, Transistions, Visual Effects) for this property.
fixed (property values must be correctly cased when querying) something else is off with that site too, will check later