Martin questions

• Sort table by background-color of last cell in row
• jQuery: Mark (select) content text by tag name without ID
• 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]

Martin answers