Fixed headers in html like table views in iOS designed for use in either html or markdown. - Requires JQuery - adapted from http://jsfiddle.net/QuVkV/3/

index.html

<p>Lorem or incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<h1>This is your facebook like button</h1>
<p>Lorem or incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

<h1>Another bar here</h1>
<p>Lorem or incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

<p style='height: 5000px;'></p>

javascript.js

$(document).ready(function(){
    $('h1').each( function() {
        $(this).wrap('<div class="bar-container" />');;
    });
    $(document).on('scroll', function(){
        $('h1').each( function() {
            if ($(this)[0].offsetTop < $(document).scrollTop()){
                if($(this)[0].offsetTop != 0) {                   
                    $.data(this, 'offset', $(this)[0].offsetTop);
                }
                $(this).css({position: "fixed", top:0});            
            }
            if ($(document).scrollTop() < $.data(this, 'offset')){
                //$.data(this, 'offset', 1);
                $(this).css({position: "relative", top: 0});           
            }
        });
    });    
});

markdown-include.html

<style>
.bar-container {
    height: 50px;
    margin-bottom: 50px;
}
h1 {   
    position: relative;
    width: 100%;
    max-width: 720px;
    height : 50px;
    margin-bottom: 40px;
    background-color: #efefef;
    -webkit-margin-before: 0;
    padding-top: 30px;
    border: solid 2px #333;
}
</style>
<script src='http://code.jquery.com/jquery-1.9.1.js'></script>

<script>
$(document).ready(function(){
    $('h1').each( function() {
        $(this).wrap('<div class="bar-container" />');
    });
    $(document).on('scroll', function(){
        $('h1').each( function() {
            if ($(this)[0].offsetTop < $(document).scrollTop()){
                if($(this).css('position') != 'fixed') {            
                    $.data(this, 'offset', $(this)[0].offsetTop);
                }
                $(this).css({position: "fixed", top:0});            
            }
            if ($(document).scrollTop() < $.data(this, 'offset')){
                $(this).css({position: "relative", top: 0});           
            }
        });
    });    
});
</script>

style.css

.bar-container {
    height: 50px;
}
.bar {    
    position: relative;
    height : 50px;
    width: 100%;
    margin-bottom: 40px;
    color: #fff;
    background-color: #000;
}