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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

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About the <head>

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Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Packages

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Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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HTML 

              
                   <!--top header-->
        <header >
            <!--most top info -->
            <div style="height: 40px; background: #f2f9ee"></div>
            <!-- End most top info -->

            <nav class="navbar  navbar-expand-lg navbar-light top-navbar" data-toggle="sticky-onscroll">
                <div class="container">
                    <a class="navbar-brand" href="#">Navbar</a>
                    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
                        <span class="navbar-toggler-icon"></span>
                    </button>

                    <div class="collapse navbar-collapse justify-content-end" id="navbarSupportedContent">
                        <ul class="navbar-nav pull-right">
                            <li class="nav-item">
                                <a class="nav-link active" href="#">Home</a>
                            </li>
                            <li class="nav-item">
                                <a class="nav-link" href="#">Services</a>
                            </li>
                            <li class="nav-item">
                                <a class="nav-link" href="#">Our Work</a>
                            </li>
                            <li class="nav-item">
                                <a class="nav-link" href="#">Pricing</a>
                            </li>
                            <li class="nav-item">
                                <a class="nav-link" href="#">About</a>
                            </li>
                            <li class="nav-item">
                                <a class="nav-link" href="#">Contact</a>
                            </li>
                            <li class="nav-item">
                                <a class="btn btn-primary" href="#">GET A QUOTE</a>
                            </li>

                        </ul>

                    </div>
                </div>
            </nav>

        </header>
        <!-- End top header-->
!

CSS 

              
                /*sticky header position*/
.sticky.is-sticky {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    z-index: 1000;
    width: 100%;
}

body {
  min-height: 1200px;
}
nav {
  background: #eaebec;
  min-height: 85px;
}
!

JS 

              
                

// Sticky navbar
// =========================
            $(document).ready(function () {
                // Custom function which toggles between sticky class (is-sticky)
                var stickyToggle = function (sticky, stickyWrapper, scrollElement) {
                    var stickyHeight = sticky.outerHeight();
                    var stickyTop = stickyWrapper.offset().top;
                    if (scrollElement.scrollTop() >= stickyTop) {
                        stickyWrapper.height(stickyHeight);
                        sticky.addClass("is-sticky");
                    }
                    else {
                        sticky.removeClass("is-sticky");
                        stickyWrapper.height('auto');
                    }
                };

                // Find all data-toggle="sticky-onscroll" elements
                $('[data-toggle="sticky-onscroll"]').each(function () {
                    var sticky = $(this);
                    var stickyWrapper = $('<div>').addClass('sticky-wrapper'); // insert hidden element to maintain actual top offset on page
                    sticky.before(stickyWrapper);
                    sticky.addClass('sticky');

                    // Scroll & resize events
                    $(window).on('scroll.sticky-onscroll resize.sticky-onscroll', function () {
                        stickyToggle(sticky, stickyWrapper, $(this));
                    });

                    // On page load
                    stickyToggle(sticky, stickyWrapper, $(window));
                });
            });
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999px

Console