IDL

An IDL (Interface Description Language) is a generic language, used to specify object interfaces independent of any particular programming language.

In HTML, most attributes have two faces: the content attribute and the IDL attribute.

The content attribute is the attribute as you set it from the content (the HTML code) and you can set it or get it via element.setAttribute() or element.getAttribute(). The content attribute is always a string even when the expected value should be an integer. For example, to set an <input> element’s maxlength to 42 using the content attribute, you have to call setAttribute(“maxlength”, “42”) on that element.