Bootstrap: HTML markup review

I am using Bootstrap for a front-end project. I would like feedback concerning my HTML markup. I have spent quite some time polishing it, and I feel it is somewhat "mature". I have run the W3C HTML validator on it, and it only complains about three things:

• My use of center tags (consider this a "known issue")

• "Element legend not allowed as child of element div in this context." (I do not understand this error.)

• My use of X-UA-Compatible in the meta tag (common practice, but not standard)

Here are other things I am aware of:

• All the JavaScript should be bundled in just one file to reduce the number of requests. (I will do this for production.)

• The same as above, but for CSS.

• The code is a little lengthy, but I prefer to keep everything in just one file.

• The code is not commented.

What are best practices I have not followed in my code?

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Other items to consider:

• Place JavaScript at the bottom (before the closing body tag).

• Find other ways to avoid the flash of unstyled content.

• Avoid hard-coding text (e.g., "DeepFlow", "System") with an eye to internationalization.

• Use CSS to change layout, not multiple



tags.

• Leave "style='display:none'" in CSS; change the class instead.

• Accessibility and its corresponding mark-up.

• Use tools like JSLint, CSSLint, in addition to the W3C validation tool.

• Good use of unique id attributes.

• Wrap input fields with label elements when possible; this allows users to click the label associated with the input field to give that field focus.

• "logo" should probably be "Qosmos Logo".

• Technically, you don't need © and the word Copyright.

• Add a body tag to help ensure consistency across all browsers.

StackExchange Code Review Q#20439, answer score: 3