WCM
WCM tip #30: Persist the Device Channel choice using the DeviceChannel cookie
When switching between the different Device Channels you can persist the choice using the DeviceChannel cookie.
WCM tip #29: You can’t use media queries on CSS references
When referencing CSS files in HTML files used with Design Manager CSS media queries are removed from the link tag.
Mavention Insert Table of Contents App for SharePoint
Mavention Insert Table of Contents is now available as an App for SharePoint.
WCM tip #28: Design Manager: easy start but limiting if you know what you're doing. Build .master yourself
Design Manager allows you to quickly implement your user experience in SharePoint but if you want to build a great public-facing website you should build the Master Page and Page Layouts yourself instead.
WCM tip #27: Use XML Sitemap and Robots.txt
On your public-facing website use the XML Sitemap and Robots.txt file to optimize your website for Internet search engines.