Layout Mode Test

This page has no doctype.

Note: Be sure to observe the test that is applicable to the browser you are using.

Mozilla Test

The browser is in the Standards or Almost standards Quirks mode.

Safari v73 Test

The browser is not in the Standards or Almost Standards mode. It is in the Quirks mode.

Almost Standards Indicator for Mozilla and Safari v73

Standards if the blue rectangles are a couple of pixels taller than a line of text. Almost standards or quirks if the rectangles are 3px tall.

Mac IE 5, Windows IE 6 and Opera 7 Test

Quirk reference
Standard reference

Safari v60 Test (not applicable to Safari v73!)

Red if quirks