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Structural Elements
Declaration: <DOCTYPE>, <html>
Head: <head>, <title>, <noscript>, <style>, <link>, <base>, <meta>
Sectioning: <body>, <hr>, <>, <main>, <header>, <footer>, <aside>, <nav>, <section>, <div>, <p>, <article>, <details>, <dialog>
iframe: <iframe>
Shadow DOM: <template>, <slot>