Markup
Markup
Markup, assets path specified in connect.php
Markup
Markup
Check if function exists
Markup, updated install style
Updated assets specification and markup
Specification reorder, assets definition

Specification reorder according to priority
Assets and absolute path definition
Simplification
Updated Open Graph, CSP domains, markup, script async, etc.

Added apis.google.com in CSP header specification in order to return
Google+ button
Open Graph: added prefix="og: http://ogp.me/ns#" specification in html
tag
Open Graph: og:description merged with description meta tag
Open Graph: twitter:card now requires default content=summary
specification
Open Graph: og:url no more required
Assets defined in config.php
Returned main element and applied layout compatibility hack in CSS
Load script asynchronously
Improved stabilization and reordered style

Added IE font-family fallback "Times New Roman" for serif
Added browser compatibility for main element
Added style for code element
Improved image scaling, form elements stabilization
Added text-align value "start" to perform LTR and RTL
Improved @media print specification
Commented apis.google.com DNS prefetch  and CSP header
Fixed assets path definition on same domain