Pressing Enter in blockquote may create nested blockquotes in Safari

Phenomenon

When pressing Enter inside a blockquote element in Safari, nested blockquote structures may be created unexpectedly. This breaks the intended quote structure and creates invalid or confusing HTML.

Reproduction example

1. Create a blockquote: <blockquote><p>Quoted text</p></blockquote>
2. Place cursor inside the blockquote text
3. Press Enter

Observed behavior

• A nested blockquote may be created: <blockquote><p>Text</p><blockquote><p></p></blockquote></blockquote>
• Or the blockquote structure may break
• DOM structure becomes malformed
• Visual appearance may be unexpected

Expected behavior

• A new paragraph should be created within the same blockquote
• No nested blockquotes should be created
• Blockquote structure should be maintained
• Behavior should be consistent with Chrome/Edge

Browser Comparison

• Chrome/Edge: Creates paragraph within blockquote (correct)
• Firefox: May break blockquote structure
• Safari: May create nested blockquotes (this case)

Notes and possible direction for workarounds

• Intercept Enter key in blockquote context
• Prevent default behavior
• Manually create paragraph within blockquote
• Normalize blockquote structure after operations