What's the difference between Full Standard, Almost Standard and Quirks Mode?

Technology Community › What’s the difference between Full Standard, Almost Standard and Quirks Mode?

VietMX Staff asked 4 years ago

When web was new to the world, the web pages were written in two versions:

Netscape Navigator
Internet Explorer

When W3C (World Wide Web Consortium) introduced new standards for web, the browsers introduced two layout modes to support new and old web standards.

Those modes are

Quirks mode
Standard mode
Almost standard mode

Quirks Mode

Browser will emulate non-standard behavior in Netscape Navigator 4 and Internet Explorer 5
This was essential in order to support websites which was built before web standards

Full Standard Mode

In Full Standard mode, behavior of browser is same as the HTML & CSS specification
Almost all modern browser uses full standard mode now

To use full standard mode, specify <!DOCTYPE html> in your HTMl document.

<!DOCTYPE html>
<html>
<head>
  <title>Document title</title>
</head>
<body>

</body>
</html>

Almost Standard Mode

In Almost Standard mode, behavior of browser is same as full standard mode but with a very small number of quirks implementation