Tooltipster is a lightweight jQuery plugin that enables you to easily create clean, HTML5 validated tooltips. The plugin is small-in-size (4.8kb minified), works fast and can be customized with ease.
Its look can be changed with CSS (theme support) and the position of the arrow, following the mouse, delay/period of the appearance can all be defined.
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Tooltips don’t use any images and any HTML can be inserted into them. Also, it works well in all browsers (including IE).