Increase font size at button click

I have a table and in the end there is a button, when click on button text size in the rows of th开发者_如何学Goe table should be double in size. Sorry I am new to JQuery so my question seems to be silly.

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If your page has only one table then try this

$(document).ready(function(){
  $("button").click(function(){
    $("tr").css("font-size","200%");
  });
});

Here tr is the table row and 200% means double text size