The document. getelementbyid method differs from IE in Firefox.

As follows, there is a text control with name = "txtversion:

 
<Div>
<Input type = "text" name = "txtversion" size = "15" value = "version" maxlength = "25">
</Div>
Based on the above information, we need to use js to obtain the value in its control. We write as follows:
VaR strversion = Document. getelementbyid ("txtversion"). value;
The above code is correct. It is correct in browsers with IE as the kernel, but Firefox has strict requirements on this and the above Code cannot pass. In Firefox, when using the document. getelementbyid method, you must add the id = "txtversion" attribute to the control, as shown below:

<Div>
<Input type = "text" name = "txtversion" id = "txtversion" size = "15" value = "version"
Maxlength = "25">
</Div>

The document. getelementbyid method differs from IE in Firefox.