2. HTML Validation
There are several methods to test or
validate HTML/XHTML pages:
- Validate by URL
- Valid by file upload
- Valid by direct input
The results will be the same regardless
of which method you choose
5. Validation Process
HTML validation process:
1. What to validate your web pages for
2. The validation process
3. Validation Tools
4. Common validation errors
6. Validation Process
1. What to validate your web pages for:
a) Doctype
b) HTML or XHTML document (or other
coding languages you have used)
c) CSS style sheet
d) Links
e) Browsers
f) Screen Resolution
g) Connectivity
7. Validation Process
2. The validation process:
Doctype - Use the correct DOCTYPE
( Document Type Definition, or DTD)
DOCTYPE tag should be placed at
the top of each web page.
It is needed by browsers or other tools
to process the document correctly.
http://www.discount-real-estate-listings-md.com/
8. Validation Process
2. The validation process:
DOCTYPE DOCUMENT TYPE DECLARATION COMMENTS
XHTML 1.0 Transitional <!DOCTYPE html PUBLIC"-//W3C//DTD XHTML Widely used by web-authoring tools. Allows
1.0 Transitional//EN" some flexibility in coding
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-
transitional.dtd">
XHTML 1.0 Strict <!DOCTYPE html PUBLIC"-//W3C//DTD XHTML
1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1- Ensures strict adherence to the XHTML 1.0
strict.dtd"> standard
XHTML 1.1 <!DOCTYPE html PUBLIC"-//W3C//DTD XHTML
1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11. Ensures strict adherence to the XHTML 1.1
dtd"> standard
XHTML 1.0 Frameset <!DOCTYPE html PUBLIC"-//W3C//DTD XHTML Used for web pages laid out in different areas
1.0 Frameset//EN" (frames) rather than a single area
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-
frameset.dtd">
XHTML 2.0 <!DOCTYPE html PUBLIC"-//W3C//DTD XHTML This is a draft DOCTYPE and is best avoided as
2.0//EN" of this writing
"http://www.w3.org/TR/xhtml11/DTD/xhtml2.
dtd">
HTML 5 <!DOCTYPE html> Used for the HTML variant of the HTML 5
specification
9. Validation Process
2. The validation process:
Validate your HTML or XHTML document
If you validate your code it will make it easier
for:
- search engines to index your web pages
- pages to load faster
- make your pages accessible for other
devices that surf the Web.
- checking coding errors by running your
pages through a validator.
10. Validation Process
2. The validation process:
Validate your Cascading Style Sheets
(CSS)
If there are errors in your CSS:
- the layout of your web pages will be
affected
- the web site will not appear correctly when
viewed in any of the main browsers.
11. Validation Process
2. The validation process:
Validate your links
Broken links in your web pages will:
- frustrate your visitors when searching for
relevant information from your site.
- affect search engine rankings. When spiders
cannot index the links on your site they will not
find your keyword rich web pages.
12. Validation Process
2. The validation process:
Check browser compatibility
The main browsers you should design your web
site for include: Internet Explorer (IE6 and above),
Firefox, Opera, and Netscape (Mozilla).
14. Validation Process
2. The validation process:
Test for different screen resolutions
The current trend is that more and more
computers are using a screen size of 1024×768
pixels:
1024×768…………………………56%
800×600………………………….28%
Higher than 1024×768…………11%
15. Validation Process
2. The validation process:
Check connectivity speeds
Web pages that contain a large number of
graphics or tables, use flash or video, will load
slowly or sometimes not at all with a dial up
connection but will be fine with a cable or dsl
connection.
16. Validation Process
3. Validation Tools:
HTML/XHTML validation
http://www.validator.w3.org/
CSS validation
http://jigsaw.w3.org/css-validator/
Link checker
http://validator.w3.org/checklink
Browser Compatibility
http://www.anybrowser.com
17. Validation Process
4. Common HTML/XHTML validation errors:
- Improper Nesting of Tags
- Missing alt tags
- Margin height and width
- Horizontal Line Color
- Border Color
18. Validation Process
Summary
If you always validate your web pages, your web
site will be loading faster, more search engine
friendly, accessible to a greater number of
devices and therefore appeal to a larger number
of visitors.
