Incorrect IntelliSense: <button type=""> suggests obsolete menu value (HTML spec allows only submit/reset/button)

[CrexCrexBy]

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.100.2 (also occurs in online version)
• OS Version: Windows_NT x64 10.0.22621 (reproducible across platforms)

Core Issue:

VS Code incorrectly includes type="menu" as a suggested value for <button> elements in IntelliSense, despite this:

• Not being a valid button type in any modern HTML specification
• Having been removed from standards 20+ years ago
• Never being properly implemented in browsers

Steps to Reproduce:

1. Create a new HTML file
2. Type <button type="
3. Open IntelliSense (Ctrl+Space)
4. Observe menu appearing in the suggestions list

Expected Behavior:

IntelliSense should only suggest the three valid HTML button types:

• submit
• reset
• button

Actual Behavior:

IntelliSense incorrectly includes:

• menu (obsolete and invalid)

Technical Documentation:

1. HTML Living Standard (WHATWG) explicitly lists only three valid types:
   https://html.spec.whatwg.org/multipage/form-elements.html#attr-button-type
2. MDN documentation confirms only three valid types:
   https://developer.mozilla.org/en-US/docs/Web/HTML/Element/button#type
3. Historical context: menu was removed in HTML 4.0 (1997)

Impact:

• Misleads developers into using invalid HTML
• Pollutes codebases with non-standard attributes
• Contradicts VS Code's goal of standards-compliant tooling

Requested Fix:

Completely remove menu from:

1. IntelliSense suggestions for button types
2. Any internal validation whitelists