Street View generates CSS errors to the Error Console of Firefox (version 3.6.8). See for example this example in the tutorial:

https://code.google.com/apis/maps/documentation/javascript/examples/streetview-map.html

After opening Street View there are two warnings like this in the Error Console:

Warning: Error in parsing value for 'font-size'.  Declaration dropped.
Source File: https://code.google.com/apis/maps/documentation/javascript/examples/streetview-map.html
Line: 0

A new warning is generated every time the Street View is navigated using the links. Because these warnings fill the Error Console it's difficult to detect real errors and warnings.


I guess that Opera (version 10.61) is still not officially supported browser but also its Error Console shows the error:

CSS - https://code.google.com/apis/maps/documentation/javascript/examples/streetview-map.html
HTML style attribute
Invalid value for property: font-size
Line 1:
  font-size: 10;
  --------------^