If you use the regular ways of taking screen shots from a web page, you just capture the showing screen. To capture the whole entire web page on G2 (Android 4.2.2), you need to do as follows:
1. Open Internet (The default web browser of LG G2)
2. open the web page you want to capture entirly
3. Press Menu Button and then select Capture Plus.
4. Use the available tools to crop the screen shot, and then hit OK
5. To view the captured image, go to File Manager > Image > Capture Plus
Lean More LG G2 Tips and Tricks