anchor.diff:          | SrcSet of string
           | Start of float
           | Step of U2<float, string>
  -        | Style of CSSProp list
  +        | Style of ICSSProp list
           | Summary of string
           | TabIndex of float
           | Target of string
  
positive.code:         | WrapMargin of obj
          | WrapOption of obj
          | WritingMode of obj
  
      [<KeyValueList>]
      type IProp =
          interface end
          
      [<KeyValueList>]
      type IHTMLProp =
  
negative.code: open Fable.Import
  
  module Props =
      [<KeyValueList>]
      type IProp =
          interface end
  
      [<KeyValueList>]
      type ICSSProp =
          inherit IProp
  
      [<KeyValueList>]
      type CSSProp =
          | BoxFlex of float
  