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Code Block
.ym-skip, .ym-hideme, .ym-print {
    left: -32768px;
    position: absolute;
    top: -32768px;

.ym-skiplinks .ym-skip:focus, .ym-skiplinks .ym-skip:active {
    left: 32768px;
    outline: 0 none;
    position: absolute;
    width: 100%;

.ym-skip:focus, .ym-skip:active {
    top: 0;



A quick examination of LESS.

  • LESS will give the ability of some conditional statements which control which CSS is rendered.
  • Example: If screen is dark, then use light text.
  • This is useful for our theming as it could replace inverted styles currently used in the preferences editor.



A quick examination of SASS.

  • In addition to mixins like in LESS, Sass has if, each, for loops like a proper programming language.

FSS Considerations

The following classes are used by UIO and Exploration Tool. The candidate framework should make it easy to create themes or customizations based on these classnames: