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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.
An expansion of the 400 Bad Request response code, used when a client certificate is required but not provided. 497 HTTP Request Sent to HTTPS Port. An expansion of the 400 Bad Request response code, used when the client has made a HTTP request to a port listening for HTTPS requests. 499 Client Closed Request.
Fires when a checkbox is checked or unchecked, either by the user or a script. No No RadioStateChange Fires when a radio button is selected, either by the user or a script. No No close onclose Fires when a request has been made to close the window. No Yes command oncommand Similar to W3C DOMActivate event.
The World Wide Web Consortium (W3C) was founded in 1994 by Tim Berners-Lee after he left the European Organization for Nuclear Research in October 1994. [4] It was founded at the Massachusetts Institute of Technology (MIT) Laboratory for Computer Science with support from the European Commission, and the Defense Advanced Research Projects Agency, which had pioneered the ARPANET, the most ...
On some browsers, you may have to click on the "Console" tab once the developer tools pane opens up. [*] In Safari, you might have to enable the Develop menu first in Preferences (⌘ Cmd +,) → Advanced → check "Show develop menu in menu bar". For OSX, use ⌥ Option + ⌘ Command + I then hit esc (escape) to open the JavaScript console.
Firefox. In Windows, go to Tools→Options; on a Mac, go to Firefox→Preferences; on Linux, go to Edit→Preferences . At the top of the Options box, click Content (if it's not already highlighted), and make sure the "Enable JavaScript" checkbox is turned on. If not, click to turn it on, and then click OK. Tip:
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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. Checkboxes are shown as empty boxes when unchecked, and ...