Unusual HTML tags

• definition: definition
• cite: citation

• pre

• code: code
• kbd: computer input
• sample: computed output
• variable: the name of a variable.

• ins: inserted text
• del: deleted text
• Defines emphasized text
• Defines text that is no longer correct
• Defines strikethrough text

Invalid tags

• <address> Defines contact information for the author/owner of a document</address>
• <article> Defines an article </article>
• <aside> Defines content aside from the page content </aside>
• Isolates a part of text that might be formatted in a different direction from other text outside it
• Overrides the current text direction
• Links the given content with a machine-readable translation
• <details> Defines additional details that the user can view or hide</details>
• <dialog> Defines a dialog box or window</dialog>
• <figure> Specifies self-contained content</figure>
• <footer> Defines a footer for a document or section</footer>
• <header> Defines a header for a document or section</header>
• <main> Specifies the main content of a document</main>
• Defines marked/highlighted text
• <meter> Defines a scalar measurement within a known range (a gauge) </meter>
• <nav> Defines navigation links</nav>
• <output> Defines the result of a calculation </output>
• <picture> Defines a container for multiple image resources</picture>
• <progress> Represents the progress of a task</progress>
• <svg> Defines a container for SVG graphics </svg>
• <template> Defines a template</template>
• Defines a date/time
• <video> Defines a video or movie</video>
• Defines a possible line-break