The difference between using Transitional or Strict for both HTML and XHTML depends largely exactly how to well you write your programming. If it is written using strict rules (and no legacy HTML through olden days) and validates under this configuration, it can be Strict, and can also be more compliant and standardized. Otherwise, if it's imperfect or contains some legacy HTML, it would include Transitional, the software can remain validated and the browser can know how you can handle who's.
(X)HTML. HTML (Hypertext Markup Language) is the primary markup language of the web, as well as being used generate and structure web results pages. Everything you see that is not styling or animation is primarily built using Html code. I'm referring here specifically to text, tables, and forms.
Flash is terrible for SEO. Yes, I know, I already said that in point number 1. But it's so important I felt I to be able to say it again. And yes, I realize that many designers state that Google can index Close your lids. But be honest, how many flash-based sites have you ever seen inside of the top 10 of your searches?
AJAX could be very tricky. Depending on browsers, users and other various conditions that may occur - AJAX can an individual a major headache. This is why I urge of which you learn the correct techniques obtain to work out how to bypass these basic problems that appear to work biggest issue with learning this subject.