Protocol for extracting HTML from various test sources.

Excessibility uses this protocol to support multiple test source types:

• Plug.Conn - Phoenix controller test responses
• Wallaby.Session - Browser-based feature test sessions
• Phoenix.LiveViewTest.View - LiveView test views
• Phoenix.LiveViewTest.Element - LiveView test elements

Extending

To add support for a custom source type, implement this protocol:

defimpl Excessibility.Source, for: MyCustomSource do
  def to_html(source) do
    # Return HTML string or Floki-parsed tree
    MyCustomSource.get_html(source)
  end
end