How to check if HTML element is/is not hidden?
5451
How do I check if an element is hidden in jQuery?
139412
jQuery: Get height of hidden element in jQuery
24210
HTML / CSS - DIV Element hidden when it shouldn't be?
19818
How do you check if a selector matches something in jQuery?
15877
How to get an HTML element's style values in javascript?
126213
Control difference between Hide() and Visible?
49446
How to check for an undefined or null variable in JavaScript?
154457
Javascript - How to detect if document has loaded (IE 7/Firefox 3)
89762
How can I determine the type of an HTML element in JavaScript?
132468
jquery fade element does not show elements styled 'visibility: hidden'
22042
How can I check whether a radio button is selected with JavaScript?
43713
How can I test if two jQuery wrapped DOM elements are the same?
131312
Detect if an element has been resized via javascript?
151243
Jquery - How to check, if child in hidden DIV is visible?
6835
How to access HTML element without ID?
104133
Unobtrusive JavaScript:  at the top or the bottom of the HTML code?
9887
How can I check if a background image is loaded?