Always Valid Lightbox is a Lightbox plugin whose markup adapts to the WP site's Doctype, in order to always provide valid HTML markup.

Mike Koepke

Denis de Bernardy

Auto Thickbox

Automatically enables thickbox on thumbnail images (i.e. opens the images in a fancy pop-up).

ppalli

Add LightBox & Title

This plugin for WordPress automatically add the rel="lightbox[ID-OF-THE-POST]" and recovers the image title.

Adam Nowak

Ez Overlay

A simple lightbox plugin designed to enable you to display html content within a popup window using just about any html element as a trigger.

hb860

Plugin Name: Always valid lightbox mod

Always Valid Lightbox Mod is a Lightbox plugin which adapts to site's DOCTYPE and provides a valid HTML markup.

Matt Martz

Shadowbox JS

Shadowbox is an online media vieiwing application similar to Lightbox and Thickbox but with more functionality. Supports all types of media.

Joffrey Quillet

Always Valid Lightbox is a Lightbox plugin which can automatically add the HTML attributes needed to trigger the effect on content image links, so that 
the user never has to add a class or an attribute to his content images in order to make the lightbox work.
Also, AVL allows the user to chose the attributes he wants inserted on his image links, depending on the Doctype declaration used in the website header.php template. 
This way, the lightbox never generates markup validation errors at the W3C Validator test.
The jQuery lightbox effect is an adaptation based on David Ryan’s jQuery lightbox tutorial : http://dryan.com/articles/jquery-lightbox-tutorial/

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