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.before() in HTML Insertion of JQuery
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How to insert html on before selected tag 
.before(html_tag) - to insert html tag before to the selected element.

Example
    $("#good_div").before('<div id="before_tag_div" style="font-size: 40px;">Before element</div>');
Working Style 
Source
<div id="best_div">
      Best Div
</div>
<div id="good_div">
      Good or Bad
</div>

Output
<div id="best_div">
      Best Div
</div>
<div id="before_tag_div" style="font-size: 40px;">
        Before element
</div>
<div id="good_div">
      Good or Bad
</div>
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