def transient_html(code: str, lifetime: float = 1):
"""Attempts to display and then hide given HTML code.
If the hiding is not possible (no ipywidgets) fall-backs to persistent display.
Arguments:
code: HTML code as a string
lifetime: number of seconds to wait before closing
"""
try:
from ipywidgets import HTML
element = HTML(code)
def delayed_close():
sleep(lifetime)
element.close()
display(element)
element.on_displayed(delayed_close())
except ImportError:
element = HTML(code)
display(element)
