HTML and XHTML come in two main versions, Transitional and Strict. And each web page needs what's called a DOCTYPE or DTD (Document Type Definition) to tell the browser what W3C standards it should apply to the page and how strictly it should follow those standards.
If, after making your code comply with the lastest standards and making it as accessible as possible, you don't use a DOCTYPE or use an outdated DOCTYPE, Internet Explorer and possibly some other browsers will detect your valid, accessible code as invalid, nonstandard ''tag soup,'' switch to Quirks Mode (called doctype switching) and render it in compliance with outdated standards, instead of in Strict or Standards Mode in compliance with the current standards.
This will cause your accessible web page to have accessibility problems.
To make your pages accessible to as many visitors and devices as possible, I recommend avoiding using the Transitional DOCTYPE and using or converting to the Strict DOCTYPE.
Here are some articles that explain it further:
Meta Tags are special HTML tags located in the top section of a web page called the header, that provide information to search engines about a web page. A few are worth using, but most aren't.
Put your formatting code in a separate CSS (Cascading Style Sheets) file to keep content and presentation separate, and your web pages accessible to visitors with disabilities.
The Best CSS Tutorial:
To get an idea of what CSS code looks like, check out my CSS file.
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