1. Link & the forgotten accessibility

    One of the most common mistakes: setting a color for a link, but not adding :hover, :focus and :active states.

    a {
    color: #ca0000;
    text-decoration: none;
    }

    /* And that is the end of link styling */
    Check out what is going on here
  2. z-index hell

    z-index is something that can measure one's frustration. The amount of digits represent the fact that the developer tried to position the div above the content, but failed miserably.

    .my-class {
    z-index: 122828282882;
    }
    Check out what is going on here