Web testing has following things to check

Link testing

Feature provided by the web aplication should be tested known as feature testing

Load testing of the web aplication or web page provided

UI testing of the web base aplication

While performing WEB Testing following features are required to be test:-

1.Functionality testing- testing the functional points of the application.

2.Link Testing- whether the link is redirecting the user to expected page.

3.Testing for Orphan pages- pages that are not linked.

4.Look and feel of the application with different browsers resolutions etc.

Specific to web based application :

1. GUI (Font Control Alignment Control Size Spelling resolution etc.)

2. Performance-response time (Page should be displayed/refreshed within certain period of time)

3. HTML tags in text box / text area.

4. Security Testing (e.g. Save the URL Clear cookies paste the URL in new browser window it should not allowed to open should redirect to login/default page also Cookies verification) Annonymous Access (Hacking)

5. Link redirections or dead link verification

I would consider the following when testing a website:

FUNCTIONALITY
1) Graphic User Interface (GUI)
a) Text
-font sizes
-spelling
b) Format (adheres to spec?)
- dialogs
- HTML links
- images
- color pallete
- flexibility (resize window)
- screen resolutions
c) Useability
- text boxes menus
- form submissions
- navigation
- authentication (login)
- advertisements (if applicable)
d) Adherence to marketing and legal

SECURITY
a) Authorization and adherence to roles (admin user guest)
b) Site and web page exploitations

PERFORMANCE
Ensure pages render with speed specified by spec.

ACCESSIBILITY
Ensure pages are accessible to the visually challenged.

COMPATIBILITY
a) Browser independence
b) Operating systems independence

LOAD
Ensure site can handle peak user load.

STRESS
Attempt to find the website's breaking point at predefined location(s).

LOCALIZATION
Verify multi-language deployments of the web-site (if applicable).