Take the 2-minute tour ×  HTML being the most widely used
language (at least as a markup language) has not gotten its due
credit. Considering that it has been around for so many years,
things like the FORM / INPUT controls have still remained same
with no new controls added.  So at least from the existing
features, do you know any features that are not well known but
very useful.  Of course, this question is along the lines of:
Hidden Features of JavaScript Hidden Features of CSS Hidden
Features of C# Hidden Features of VB.NET Hidden Features of Java
Hidden Features of classic ASP Hidden Features of ASP.NET Hidden
Features of Python Hidden Features of TextPad Hidden Features of
Eclipse  Do not mention features of HTML 5.0, since it is in
working draft  Please specify one feature per answer.  comments
disabled on deleted / locked posts  locked by Robert Harvey Mar
10 '12 at 3:52   36 Answers  That's only lowly related to HTML,
but very few people know it.  People abuse the <meta> tag with
the http-equiv attri