Hertz measures cycles per second - one Hertz is one cycle per second. Unlike gauss that is a measurement unit for the strenght of a specific thing (an electromagnetic field), hertz is a generic frequency measurement.
Prepend is a word that means to attach content as a prefix. It is often used in different kinds of programming and in automated processes. Some prepending is done manually as a user. For example, a prepend command could be used in a scripting language that a programmer would enter into a certain function or code module. It would add certain characters of text to the beginning of some variable or object.
The .prepend() method inserts the specified content as the first child of each element in the jQuery collection (To insert it as the last child, use .append()). The .prepend() and .prependTo() methods perform the same task. The major difference is in the syntaxâspecifically, in the placement of the content and target. With .prepend(), the selector expression preceding the method is the container into which the content is inserted.