add test for more elements up to caption

pyscript.core/test/ui/demo.py

@@ -2,13 +2,14 @@ from textwrap import dedent
 
 import examples
 import styles
-from pyscript import when, window
 from pyweb import pydom
 from pyweb.ui import elements as el
 from pyweb.ui import shoelace
 from pyweb.ui.elements import a, button, div, grid, h1, h2, h3, input_
 from pyweb.ui.markdown import markdown
 
+from pyscript import when, window
+
 MAIN_PAGE_MARKDOWN = dedent(
     """
     ## What is pyweb.ui?