How to insert markup into a table using javascript -

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I have a table row with four cells. I am trying to use JavaScript to insert: 

  & lt; / Tr & gt; & Lt; Tr & gt;

Between the two cells which basically make one to two rows (at certain screen sizes).

I need to change it: 

  & lt; Table & gt; & Lt; TR & gt; & Lt; TD & gt; Accessories & lt; / TD & gt; & Lt; TD & gt; Accessories & lt; / TD & gt; & Lt; TD & gt; Accessories & lt; / TD & gt; & Lt; TD & gt; Accessories & lt; / TD & gt; & Lt; / TR & gt; & Lt; / Table & gt;

In: 

  & lt; Table & gt; & Lt; TR & gt; & Lt; TD & gt; Accessories & lt; / TD & gt; & Lt; TD & gt; Accessories & lt; / TD & gt; & Lt; / TR & gt; & Lt; TR & gt; & Lt; TD & gt; Accessories & lt; / TD & gt; & Lt; TD & gt; Accessories & lt; / TD & gt; & Lt; / TR & gt; & Lt; / Table & gt;

This is my script: 

  $ ('table tr td: nth-child (3)'). ('& Lt; / tr & gt; & lt; tr & gt;');

And what I find here: 

  & lt; Table & gt; & Lt; TR & gt; & Lt; TD & gt; Accessories & lt; / TD & gt; & Lt; TD & gt; Accessories & lt; / TD & gt; & Lt; TR & gt; & Lt; / TR & gt; & Lt; --- Note that & lt; / Tr & gt; & Lt; Tr & gt; & Lt; Tr & gt; & Lt; / Tr & gt; it happens! & Lt; TD & gt; Accessories & lt; / TD & gt; & Lt; TD & gt; Accessories & lt; / TD & gt; & Lt; / TR & gt; & Lt; / Table & gt;

Tags are displayed in the right place, but they are switched around!

What's going on here? Can you add any other line and the last two td

code> elements in the new row 

  $ ('& lt; tr & gt;') insertAfter ('tr'). Attachments ($ ('td'). Piece (-2))


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