The document contains CSS code to apply transitions and rotations to images on hover. Images within different ID tags will rotate at different speeds and angles on hover: #socialicons images rotate 70 degrees in 0.2 seconds, #socialicons1 images rotate 360 degrees in 0.8 seconds, and #socialicons2 images rotate -360 degrees in 0.5 seconds. The HTML portion then displays social media icons with these IDs that will rotate on hover as defined by the CSS.