Favicon: .ico or .png / correct tags?
13159
favicon.png vs favicon.ico - why should I use PNG instead of ICO?
36311
How to associate an image with a term taxononmy and publish it on frontpage?
97096
What are the different usecases of PNG vs. GIF vs. JPEG vs. SVG?
22349
Wrong favicon displayed on Google's mobile SERP
26927
Is it alright to use multiple h1 tags on the same page, but style them differently?
77695
How to get a website's favicon with PHP?
114403
Are the icons used on the WMD editor on Stack Overflow going to be changed?
70964
All Stack Exchange site logos are showing up as the 3D Printing one
41459
How do I handle thumbnails of white-on-transparent pngs in Bridge?
58335
Link a img id="logo"
50791
SEO regarding using separate  tags for the logo and website name
131579
Including images in comments: Is it fine to use imgur link in the comments?
48768
Is there some markup to post tags?
15884
How is an icon for a site created or added to that site?
130108
Website logo text - best tag for SEO purposes?
74946
Android icon vs logo
108946
There's something not quite right with the achievements drop down on stackexchange.com (All of the site icons are wrong)