This is
an HTML5 page
for me to have fun with. It is intended to be syntactically valid
both as HTML (i.e., text/html) and
as XHTML (i.e., application/xhtml+xml): see
the recommendation
on polyglot markup
for details (although this is not exactly polyglot markup because of
the way the inline stylesheet is escaped).
Everyone should know that and that .
This paragraph is editable. By clicking on it (or otherwise selecting it) you should be able to modify it through your web browser.