Validators and linting tools
Generally speaking, writing HTML and CSS is pretty forgiving. You can nest the odd thing incorrectly, miss the occasional quotation mark or self-closing tag and not always notice a problem. Despite this, on an almost weekly basis I manage to befuddle myself with incorrect markup. Sometimes it's a slip-up like accidentally typing an errant character. Other times it's school-boy errors like nesting a div inside a span (invalid markup as a span is an inline element and a div is a block level element—leading to unpredictable results). Thankfully, there are great tools to help out. At worst, if you're encountering a weird issue, head over to http://validator.w3.org/ and paste your markup in there. It will point out all ...
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