input: from typing import List
  
  def generate_html_table(genre: str) -> str:
      """ Generate an HTML table displaying information about the top 10 bestselling books in a specific genre.
      >>> generate_html_table('Fantasy')
      '<table><tr><th>Title</th><th>Author</th><th>Genre</th><th>Sales</th></tr><tr><td>[Book1 Title]</td><td>[Book1 Author]</td><td>Fantasy</td><td>[Book1 Sales]</td></tr><tr><td>[Book2 Title]</td><td>[Book2 Author]</td><td>Fantasy</td><td>[Book2 Sales]</td></tr>...</table>'
      """
output:     table = "<table><tr><th>Title</th><th>Author</th><th>Genre</th><th>Sales</th></tr>"
      for i in range(1, 11):
          table += f"<tr><td>[Book{i} Title]</td><td>[Book{i} Author]</td><td>{genre}</td><td>[Book{i} Sales]</td></tr>"
      table += "</table>"
      return table