HTML5 warnings, constraints, observations, notes, parallels between elements, examples

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→	html documents properly encoded - declared - decoded
→	browsers encoding precedence
→	the microdata concept
→	encoding declaration state
→	transparent content model
→	fallback content
→	browsing contexts
→	placeholder label option
→	document outline; install HTML5 outliner
→	the cross browser compatibility
→	date ⁄time using Z or GMT+/UTC+ or GMT-/UTC-
→	local date and time vs. global date and time
→	valid time-datetime formats in HTML5
→	meter: segments, values, colors, attributes
→	the consequences of not resizing manually the images
→	client-side image map vs. server-side image map
→	hgroup outline (heading + subheadings) example
→	shapes and their coordinates: how to
→	hyperlink versus external resource link
→	avoid adding comments within elements that expect text content
→	the forbidden characters within a comment
→	data element vs. time element
→	caption versus figcaption: see the difference
→	div versus span: when each should be used ?
→	style element vs. style attribute
→	title element vs. title attribute
→	br element vs. the wbr element
→	ul versus ol
→	span element versus span attribute
→	option(s) selected versus option(s) pre-selected
→	disable an option versus disable a group of options
→	link element: examples & interpretations
→	base tag: if precede then applies
→	figure, figcaption tags:1 example
→	figure, figcaption tags:3 examples
→	select element: example and interpretation
→	ruby, rp , rt example
→	q: wrong usage: do not use the q element for its visual effect
→	select element: constraints
→	iframe: src vs srcdoc; iframe fallback content