What is the difference between having a page doctype or not having one, apart from the fact that the page should have one ?
I am asking that because I use a slider inside this page - with the doctype, the slider has a wrong high (150px), and without it, it has the desired high (with the correct ratio high/width from the iframes which are in the slider).
I have tried with multiple doctypes, with the same result for each of them.
doctype to state what flavour of
html you are using, the browser will revert to quirks mode, where it tries to parse your markup through a series of best guesses. Nothing about this is optimal. You have an invalid hypertext document and the browser can only guess at how to parse it.
In short, you need a
doctype at the start of every hypertext document.
For a Complete List of HTML and xHTML Doctype Declarations, see: