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Currently it's opening in separate tab as an image file when i click on size chart on product page.

SIZE CHART

  • If you do not want to use ready made functionality and you think that some one write code for you here then it is not possible. – user55548 Mar 14 '19 at 11:01
  • Why are you so rude? who asked. don't answer if u don't want to. – rony Mar 14 '19 at 11:57
  • I have provide you ready made extension link and you vote down. If you do not want solution then why you are asking here. This extension will work. If you do not want to use then don't use. But this will satisfy your requirement. Still you down vote. – user55548 Mar 14 '19 at 12:31