Tab key inserts tab character instead of moving to next cell

Phenomenon

When editing a table cell in a contenteditable element, pressing Tab inserts a tab character instead of moving to the next cell. This makes table navigation difficult.

Reproduction example

1. Create a table in contenteditable
2. Click inside a table cell
3. Press Tab key

Observed behavior

• Tab character is inserted into the cell
• Cursor does not move to next cell
• Table navigation is broken
• Users cannot easily navigate between cells

Expected behavior

• Tab should move to next cell
• Shift+Tab should move to previous cell
• Tab character should not be inserted
• Navigation should work like spreadsheet applications

Browser Comparison

• All browsers: Tab inserts character (default behavior)
• Custom handling needed for table navigation

Notes and possible direction for workarounds

• Intercept Tab key in table cells
• Prevent default behavior
• Find next/previous cell
• Move cursor to next cell
• Handle edge cases (last cell, first cell)