In gui testing  alignment,spell checks and colors are 
tested.

For alignment -->we will see whether alignments are proper 
r not.
spell check -->we will see for spelling mistakes.
colors-->whether the colors r according to standards r not 
we will check

GUI issues can be mainly classified as:
1) Spell checks and Gramatical correctness.
2) Proper Layouts.
3) Tabbing(moving across the fields by pressing 'TAB' key)
4) Consistency of the options with respect to Theme, color, 
font, Position and Layout ...etc.,

GUI testing is main part of the product or application from
which user can easily grab the information.

In GUI testing there are several parts as fallows.
   a)In this check all pages having unique background or 
     not.
   b)background should be simple and not using the dark 
     color.
   c)Test on the background is clearly visible and not in
     the embossing format.
   d)Image having text description or animation so check it 
     with each and every frame display right picture and 
     right information.
   e)check table structure not disturb the text on the 
     application. Also for internet marketing application 
     display table containing information related 
     to the equipment which are for sell and there rates 
     are clearly visible.
   f)Text boxes and button and each and every thing on the 
      application display the tool tip.
   g)All the buttons and text boxes have identical 
      color.
   h)Hadar and Footer section of the application are 
     unique.
   i) Each link should work and display the information 
      page and this page should have button for go to back 
      to the main page.
   j) Check the application should be compatible on 
      different browser. It should display unique format of 
      the application in all the browser. 
   k) from GUI Messages,warning messages, error messages 
      are understandable.