1. A computer program product, comprising: a computer readable storage medium to store a computer readable program, wherein the computer readable program, when executed on a computer, causes the computer to perform operations for customizing behavior of a JavaScript widget on a web page via Cascading Style Sheet (CSS), the operations comprising: creating a HyperText Markup Language (HTML) Document Object Model (DOM) element; assigning a CSS class from the presentation definition language to the DOM element; obtaining a computed style for the DOM element, wherein the computed style is computed based on the CSS class assigned to the DOM element; extracting a CSS styling property from the computed style; parsing the CSS styling property to determine a widget-level option contained within the CSS styling property to be applied to the widget; and applying the widget-level option to the widget.
1. A computer program product, comprising: a computer readable storage medium to store a computer readable program, wherein the computer readable program, when executed on a computer, causes the computer to perform operations for customizing behavior of a JavaScript widget on a web page via Cascading Style Sheet (CSS), the operations comprising: creating a HyperText Markup Language (HTML) Document Object Model (DOM) element; assigning a CSS class from the presentation definition language to the DOM element; obtaining a computed style for the DOM element, wherein the computed style is computed based on the CSS class assigned to the DOM element; extracting a CSS styling property from the computed style; parsing the CSS styling property to determine a widget-level option contained within the CSS styling property to be applied to the widget; and applying the widget-level option to the widget. 7. The computer program product of claim 1 , wherein the computer program product, when executed on the computer, causes the computer to perform additional operations, comprising: checking a formatting validity of the styling property and the option, wherein the formatting validity is defined by a predefined standard in accordance with the widget; and implementing a default option within the widget in response to a determination that either the styling property or the option is invalid.