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As leakim suggested, you can use a custom solution. Otherwise the dialog boxes are mostly browser/OS based. You will have very (if any) control over appearance/styling/aesthet<wbr />ics in general.
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As leakim suggested, you can use a custom solution. Otherwise the dialog boxes are mostly browser/OS based. You will have very (if any) control over appearance/styling/aesthetics in general.

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 &nbsp; &nbsp; When I create one of those Javascript alert boxes using window.alert, is it possible to center and/or underline some of the text?
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     When I create one of those Javascript alert boxes using window.alert, is it possible to center and/or underline some of the text?

window.alert centering and underlining

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.

JavaScript

A scripting language is a programming language that supports scripts, programs written for a special run-time environment that automate the execution of tasks that could alternatively be executed one-by-one by a human operator. Scripting languages are often interpreted (rather than compiled). Primitives are usually the elementary tasks or API calls, and the language allows them to be combined into more complex programs. Environments that can be automated through scripting include software applications, web pages within a web browser, the shells of operating systems (OS), embedded systems, as well as numerous games. A scripting language can be viewed as a domain-specific language for a particular environment; in the case of scripting an application, this is also known as an extension language.

Scripting Languages

Cascading Style Sheets (CSS) is a language used for describing the look and formatting of a document written in a markup language. Usually used to change web pages and user interfaces written in HTML, it can also be applied to any kind of XML document. CSS is designed primarily to distinguish the content of a document from its presentation.