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  2. W3C Markup Validation Service - Wikipedia

    en.wikipedia.org/wiki/W3C_Markup_Validation_Service

    The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type definition (DTD). Markup validation is an important step towards ensuring the technical quality of web pages.

  3. HTML form - Wikipedia

    en.wikipedia.org/wiki/HTML_form

    Forms can resemble paper or database forms because web users fill out the forms using checkboxes, radio buttons, or text fields. For example, forms can be used to enter shipping or credit card data to order a product, or can be used to retrieve search results from a search engine .

  4. JavaScript - Wikipedia

    en.wikipedia.org/wiki/JavaScript

    This is an accepted version of this page This is the latest accepted revision, reviewed on 23 February 2025. High-level programming language Not to be confused with Java (programming language), Javanese script, or ECMAScript. JavaScript Screenshot of JavaScript source code Paradigm Multi-paradigm: event-driven, functional, imperative, procedural, object-oriented Designed by Brendan Eich of ...

  5. JavaScript syntax - Wikipedia

    en.wikipedia.org/wiki/JavaScript_syntax

    The syntax of JavaScript is the set of rules that define a correctly structured JavaScript program. The examples below make use of the log function of the console object present in most browsers for standard text output .

  6. Checkbox - Wikipedia

    en.wikipedia.org/wiki/Checkbox

    Sample binary-state checkboxes, with some options disabled. A checkbox (check box, tickbox, tick box) is a graphical widget that allows the user to make a binary choice, i.e. a choice between one of two possible mutually exclusive options. For example, the user may have to answer 'yes' (checked) or 'no' (not checked) on a simple yes/no question.

  7. Help : Wikipedia: The Missing Manual/Customizing Wikipedia ...

    en.wikipedia.org/.../Easier_Editing_with_JavaScript

    There's no edit toolbar, because there's no need for buttons for inserting a signature, or a table, or other text. There's also a message about using the "Show preview" button to test the added JavaScript before saving the page. 4. Add an edit summary (Adding JavaScript for user tabs, for example) and then click the "Show preview" button.

  8. Web IDL - Wikipedia

    en.wikipedia.org/wiki/Web_IDL

    Web IDL is an interface description language (IDL) format for describing APIs (application programming interfaces) that are intended to be implemented in web browsers.Its adoption was motivated by the desire to improve the interoperability of web programming interfaces by specifying how languages such as ECMAScript should bind these interfaces.

  9. HTML element - Wikipedia

    en.wikipedia.org/wiki/HTML_element

    An example is the checked for checkboxes: < input type = checkbox checked > In the XML (and thus XHTML ) syntax, though, a value is required, and the name should be repeated as the value: