HTML 5 validation CSS Pseudoclass invalid use with required attribute
60919
Delay HTML5 :invalid pseudo-class until the first event
103688
Why do the :before and :after pseudo-elements require a 'content' property?
38082
Why isn't it possible to combine vendor-specific pseudo-elements/classes into one rule set?
67392
CSS injection fails using declaration in content_scripts, but works when loaded via injected JavaScript
42382
Using the HTML5 "required" attribute for a group of checkboxes?
133591
Validate (X)HTML in Python
128435
How do I add custom validations to Webform?
114265
Is there a workaround to make CSS classes with names that start with numbers valid?
101885
HTML attribute with/without quotes
143159
Is it possible to use an input value attribute as a CSS selector?
38134
How to apply !important using .css()?
63919
XSD - one of 2 attributes is required?
84411
How to prevent invalid characters from being typed into input fields
5542
Rails 3 - Referencing a CSS class to form elements in an Object Dot Style
4316
Selecting and manipulating CSS pseudo-elements such as ::before and ::after using javascript (or jQuery)
82176
Set custom HTML5 required field validation message
148869
:before pseudo-class doesn't work with images