HTML & CSS: common mistakes

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Today we are going to see something half way between funny and serious: common mistakes we make while using HTML and CSS.

Why is it funny? Because sometimes those mistakes are so basic that when talking about them we usually react saying we don't make such mistakes. But then... when it happens, for any reason - even the most incredible - the only thing we can do is laugh. Mistakes are always just around the corner. The better we know them, the easier we are going to avoid them.

And when it happens... well... just have a laugh!

HTML5: The importance of !DOCTYPE

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As our beloved W3C site states:

"When authoring document is HTML or XHTML, it is important to Add a Doctype declaration."

And you perfectly know why... don't you?
Ok... for those of you that don't know why, here's the explanation:

"There is not just one type of HTML, there are actually many: HTML 4.01 Strict, HTML 4.01 Transitional, XHTML 1.0 Strict, and many more. [...] Why specify a doctype? Because it defines which version of (X)HTML your document is actually using, and this is a critical piece of information needed by some tools processing the document. [...] with most families of browsers, a doctype declaration will make a lot of guessing unnecessary, and will thus trigger a "standard" rendering mode."

As you can see it's definitely not trivial. But why am I talking about it? Well, it has to do with HTML5.