How do I know if Internet Explorer is in quirks mode?

9 Answers. In Firefox and Opera you can determine if your browser is in “quirks mode” by checking page info. Using document. compatMode , will tell you the mode you are in with most browsers.

What is the difference between standard mode and quirks mode?

In quirks mode, layout emulates nonstandard behavior in Navigator 4 and Internet Explorer 5. In full standards mode, the behavior is (hopefully) the behavior described by the HTML and CSS specifications. In almost standards mode, there are only a very small number of quirks implemented.

How do I stop quirks mode?

Rules to obey in order to avoid Quirks mode activation

1. The DOCTYPE element should be the first thing you include in your page.
2. Don’t include comments/javascript/xml or whatever before the DOCTYPE element.
3. Check the DOCTYPE declarations per standards here and use the latest whenever possible.

What is quirks mode browser?

In computing, quirks mode refers to a technique used by some web browsers for the sake of maintaining backward compatibility with web pages designed for old web browsers instead of strictly complying with W3C and IETF standards in standards mode.

What’s the difference between IE and quirks mode?

Standard: There are two box models, the traditional and the W3C. Obviously, the W3C one, where the width excludes padding and borders, is the standard. In IE, the rendering mode decides which box model it follows. In quirks mode it uses the traditional model, in strict mode the W3C model.

Are there any Doctypes that trigger quirks mode?

Therefore most doctypes trigger strict mode: show according to pure standards. Any new or unknown doctype triggers strict mode. The problem was that some pages written in quirks mode did have doctypes. Therefore each browser has its own list with doctypes that trigger quirks mode. See this browser comparison chart for an overview of these lists.

What does document.compatMode mean in quirks mode?

In most browsers, the Document Object Model extension document.compatMode indicates the rendering mode for the current page. In standards mode and almost-standards mode, document.compatMode contains the value “CSS1Compat”, while in quirks mode it equals “BackCompat”.

What does CSS quirks do in strict mode?

In IE Windows this only works in strict mode. Standard: CSS requires most values to have a unit. If such a value doesn’t have a unit it’s ignored. However, in quirks mode all browsers automatically append the unit px to unitless values. Standard: The .test:hover selector (without an element selector like p.test:hover ) always works.