Some “pros” believe, they can prevent visitors from copying text using constructs like
document.onselectstart=new Function ("return false");
– often in combination with “ondragstart” or “oncontextmenu”.
Dear web designers: Event handlers, as “onselectstart”, are intended for applications, where the browser should notice, that elements are selected or dragged by the user, for example in an editor of a CMS or an interactive application – and not to twist the regular behaviour of the browser in a way to make certain functions completely unusable!
Dear authors: No, not every visitor wants to misappropriate content, just because he selects parts of the text using the mouse. Maybe someone just wants to look up a term in a search engine – and to be able to select the term in the text makes this much easier.