>>> import albatross
>>> ctx = albatross.SimpleContext('.')
>>> ctx.locals.field = '<img src="http://rude.pictures.r.us/">'
>>> albatross.Template(ctx, '<magic>', '''
... Safe: <al-value expr="field" whitespace>
... Oops: <al-value expr="field" noescape whitespace>
... ''').to_html(ctx)
>>> ctx.flush_content()
Safe: &lt;img src=&quot;http://rude.pictures.r.us/&quot;&gt;
Oops: <img src="http://rude.pictures.r.us/">
