TestComplete shows this message when you disable the Use CSS pixels for scaled pages project property.
When the property is enabled (by default), TestComplete considers the browser zoom and DPI setting when getting the size and coordinates of elements in tested web pages. This way, if the browser zoom is not set to 100% or the DPI setting differs from 100% (96 DPI), TestComplete gets the size and coordinates of tested web elements correctly.
Creating and running web tests with this property disabled is deprecated. In this mode, TestComplete may fail to get the size and coordinates of tested web elements correctly.
We recommend that you keep the property enabled.
See Also
Project Properties - General Web Testing Options
Web and RIA Testing