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figure

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$(window).scroll(function () {
  // this will work when your window scrolled.
  var scroll = $(window).scrollTop();
  if (scroll > 100) {
    $(".header").addClass("header-scrolled");
  } else {
    $(".header").removeClass("header-scrolled");
  }
});

Gruber avoided using curly braces in Markdown to unofficially reserve them for implementation-specific extensions. Markdown Extra adds the following features to Markdown:

• markdown markup inside HTML blocks
• elements with id/class attribute
• fenced code blocks that span multiple lines of code
• tables
• definition lists
• footnotes
• abbreviations