MediaWiki:Common.js

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$(function () {
  // Replace the header logo with a custom HTML block
  $('.vector-header-logo').html(`
    <a href="/wiki/Main_Page" style="display:block;">
      <img src="https://telematics.transight.com/images/logo.png" style="max-height:60px;">
    </a>
  `);

  // Optional: hide site name
  $('.vector-header-title').hide();
});