feature: If hidden="until-found", it's not display: none.
      #879
    
    
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hiddenattribute, which used to have only a boolean value, now also has a newuntil-foundvalue.ref: whatwg/html@f5def65
Elements with
hidden="until-found"will havecontent-visibility: hiddenapplied instead ofdisplay: none.If specified with
display: none, it may not be found in in-page searches.ref: HTML の hidden 属性が列挙型に変更され hidden="until-found" が追加
To avoid this problem, the style specification for
hiddencase has been modified.sample: https://codepen.io/yamanoku/pen/YzYpoqG