The two modes that are used for interpreting CSS are quirks mode and strict mode. Quirks mode will allow web pages to display using the old rules. Strict mode specifies to use the latest standard. If the webpage starts with a DOCTYPE with Strict element then it would be using the strict mode.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
For a detailed information refer to the below link.
http://www.quirksmode.org/css/quirksmode.html
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