Recommends with Attenuation Factor: 0.0006927332Also looking at this pair of tags <fieldset/> inside <fieldset/>
  • The parent tag <fieldset/> with the Content model section and the child tag <textarea/> with the Categories section have matches: Flow content

first tag section

<textarea/>

Contexts in which this element can be used

Content model

BrowserWeb HTMLWeb APICanIUse
FirefoxYes1+--
SafariYes1+--
ChromeYes1+--
OperaYes8+--
EdgeYes79+--
Edge (Legacy)12+12+--
Internet ExplorerYes5+--
Firefox AndroidYes4+--
Safari iOSYes1+--
Chrome AndroidYes18+--
WebView AndroidYes1+--
Samsung InternetYes1.0+--
Opera AndroidYes10.1+--

Result of the ability to include a tag in a tag

Yes, you can!
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last tag section

<fieldset/>

Contexts in which this element can be used

Content model

BrowserWeb HTMLWeb APICanIUse
FirefoxYes1+--
SafariYes3+--
ChromeYes1+--
OperaYes12.1+--
EdgeYes79+--
Edge (Legacy)12+12+--
Internet ExplorerYes5.5+--
Firefox AndroidYes4+--
Safari iOSYes1+--
Chrome AndroidYes18+--
WebView AndroidYes1+--
Samsung InternetYes1.0+--
Opera AndroidYes12.1+--