The question is old, but you can see which errors appear on the page by opening the console in the so-called "Developer Tools", which is a native tool in modern browsers (11/11/2017).
To open the console, you can search for something like "Developer Tools" in the browser options tabs or press shortcut key(s):
- Firefox1, Chrome1, IE 111, Edge1: F12
- Opera1: CTRL + SHIFT + i
- Safari on macOS: Option + Command + i
When seeing which errors appear on console, it is possible to identify where you are causing the error and the reason, including identifying the code line:
This way it is easier to correct the error by checking the compatibility between browsers and making the proper correction.
1 In Windows 10.
Can you put the code here? So we can take a look and help solve.
– Sergio
The firefox console itself can point out errors and warnings and you can also test performance.
– Guilherme Nascimento
can a fiddle? and specific best mistakes happen...
– Kup
firefox has the native console or http://getfirebug.com/, for IE it is possible to use the console
– Pedro Sanção