Martin questions

• Highlight linked headline
• jQuery - detecting the general platform Windows / Linux / Apple
• jQuery: Get tag inside element with class
• jQuery: replace() in html()
• PHP: Convert html-entity-encoded uppercase character to lowercase
• jQuery: Add file type class to links for ANY file type
• CSS @supports (::pseudo-element)
• PHP strtotime: Get previous month [duplicate]
• How to float an element left with full height of the wrapper?

Martin answers