What is quirks mode?

you can read in this links
:

http://en.wikipedia.org/wiki/Quirks_mode

http://www.quirksmode.org/css/quirksmode.html

http://www.cs.tut.fi/~jkorpela/quirks-mode.html

Modern browsers generally try to
render HTML content according to the
W3C recommendations. However, to
provide compatibility with older web
pages, and to provide additional
“intuitive” functionality, all
browsers support an alternative
“quirks mode”.

Quirks mode is not, however, a
standard. The rendering of any page in
quirks mode in different browsers may
be different. Whenever possible, it is
better to adhere to the W3C standards
and try and avoid depending on any
past or present browser quirks.

Generally, quirks mode is turned on
when there is no correct DOCTYPE
declaration, and turned off when there
is a DOCTYPE definition. However,
invalid HTML – with respect to the
chosen DOCTYPE – can also cause the
browser to switch to quirks mode.

More information on the different
quirks modes in different browsers can
be found at QuirksMode.org

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