MediaWiki:TextTools.js

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$(document).ready(function() {

function resizeText(multiplier) {

  newsize = parseInt($("table").css("font-size")) + (multiplier * 2) + "px";
  $("table, table.storytable, table.storytable > tr > th, table.storytable > tr > td, table.storytable > * > tr > th, table.storytable > * > tr > td").css("font-size", newsize);
}

  $(".plustext").on("click", function() {resizeText(1);});
  $(".minustext").on("click", function() {resizeText(-1);});

})