What is the Microsoft logo that shows up when viewing project.json?

Question

When clicking the logo, it toggles between being visible on hover and being always visible. What is it meant to do? Is it some kind of indicator?

Answer 1

I just noticed that when clicking it, the status bar at the bottom says:

Web Essentials: Global settings updated

It seems to be a new feature in Web Essentials:

Show logo watermarks in editor
For certain files, a watermark of the associated logo is shown in the top right corner.

Currently it shows a logo for 5 files:

{ "bower.json", "bower.png"},
{ "package.json", "npm.png"},
{ "project.json", "vs.png"},
{ "gruntfile.js", "grunt.png"},
{ "gulpfile.js", "gulp.png"},