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The .wrap() function can take any string or object that could be passed to the $() factory function to specify a DOM structure. This structure may be nested several levels deep, but should contain only one inmost element. A copy of this structure will be wrapped around each of the elements in the set of matched elements. This method returns the original set of elements for chaining purposes.
Consider the following HTML:
Elements are considered visible if they consume space in the document. Visible elements have a width or height that is greater than zero.
Elements with visibility: hidden or opacity: 0 are considered visible, since they still consume space in the layout.
Elements that are not in a document are considered hidden; jQuery does not have a way to know if they will be visible when appended to a document since it depends on the applicable styles.
This selector is the opposite of the :hidden selector. So, every element selected by :visible isn't selected by :hidden and vice versa.
All option elements are considered hidden, regardless of their selected state.
During animations that hide an element, the element is considered visible until the end of the animation. During animations to show an element, the element is considered visible at the start at the animation.
How :visible is calculated was changed in jQuery 1.3.2. The release notes outline the changes in more detail.
jQuery 3 slightly modifies the meaning of :visible (and therefore of :hidden). Starting with this version, elements will be considered :visible if they have any layout boxes, including those of zero width and/or height. For example, br elements and inline elements with no content will be selected by the :visible selector.
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