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HTML

About HTML Preprocessors

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

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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Insecure Resource

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

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).

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

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About External Resources

You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

If the stylesheet you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

You can also link to another Pen here, and we'll pull the CSS from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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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.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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About External Resources

You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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Packages

Add Packages

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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About Packages

Using packages here is powered by Skypack, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ES6 import usage.

All packages are different, so refer to their docs for how they work.

If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.

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HTML 

              
                .mui-content-container
    .mui-row
        .mui-column.-s12.-m8.-m-offset-2.-l6.-l-offset-3
            // Card
            .mui-card._shadow-1._separate-1
                .header.-blue-3-bg
                    h5 Lorem ipsum
                .content.-white-bg
                
                    // Username
                    .mui-input-wrapper
                        label.mui-input-label Username
                        .mui-input-hint
                            span Username (min 3 characters, only letters allowed)
                            span.mui-input-indicator
                                span.validicon
                                    svg.mui-svg-icon
                                        use(xlink:href='#mui-svg-icon--check')
                                span.invalidicon
                                    svg.mui-svg-icon
                                        use(xlink:href='#mui-svg-icon--close')
                        .mui-input#example-username(data-regexp='^[a-zA-Z]{3,}$' data-validation-delay='1000')
                            input(type='text' placeholder='Your username')

                    // Password
                    .mui-input-wrapper._separate-1
                        label.mui-input-label Password
                        .mui-input-hint
                            span We recommend to use 12 characters or more
                            span.mui-input-indicator
                                span.validicon
                                    svg.mui-svg-icon
                                        use(xlink:href='#mui-svg-icon--check')
                                span.invalidicon
                                    svg.mui-svg-icon
                                        use(xlink:href='#mui-svg-icon--close')
                        .mui-input#example-password(data-regexp='^.{12,}$' data-validation-delay='1000')
                            input(type='password' placeholder='Your password')

                    // Checkboxes
                    ._separate-top-2
                        .mui-checkbox#example-checkbox-1
                            input(type='checkbox')
                            label
                                span.icon
                                    span.symbol
                                        svg.mui-svg-icon
                                            use(xlink:href='#mui-svg-icon--check')
                                span.text Subscribe lorem, ipsum dolor
                        .mui-checkbox._separate-1#example-checkbox-2
                            input(type='checkbox')
                            label
                                span.icon
                                    span.symbol
                                        svg.mui-svg-icon
                                            use(xlink:href='#mui-svg-icon--check')
                                span.text Send me lorem ipsum dolor

                    // Next button
                    ._separate-top-2._text-right
                        button.mui-button.-blue-3-bg.-f-blue-4-bg#example-next-button
                            span next
                            svg.mui-svg-icon
                                use(xlink:href='#mui-svg-icon--arrow-right')


// Icons
.mui-svg-sprite
    svg(version='1.1', xmlns='http://www.w3.org/2000/svg')
        symbol#mui-svg-icon--check(viewBox='0 0 512 512')
            path(d='M186.301 339.893L96 249.461l-32 30.507L186.301 402 448 140.506 416 110z')
        symbol#mui-svg-icon--close(viewBox='0 0 512 512')
            path(d='M405 136.798L375.202 107 256 226.202 136.798 107 107 136.798 226.202 256 107 375.202 136.798 405 256 285.798 375.202 405 405 375.202 285.798 256z')
        symbol#mui-svg-icon--arrow-right(viewBox='0 0 512 512')
            path(d='M85 277.375h259.704L225.002 397.077 256 427l171-171L256 85l-29.922 29.924 118.626 119.701H85v42.75z')
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CSS
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JS 

              
                document.addEventListener('DOMContentLoaded', () => {
    // "Get" returns previously created Muilessium components.
    // We specify the components type and the ID of the html element.
    const username  = Muilessium.get('Input',    'example-username');
    const password  = Muilessium.get('Input',    'example-password');
    const checkbox1 = Muilessium.get('Checkbox', 'example-checkbox-1');
    const checkbox2 = Muilessium.get('Checkbox', 'example-checkbox-2');
    const button    = Muilessium.get('Button',   'example-next-button');

    // Some components have events...
    button.addEventListener('click', () => {
        // Some components have methods...
        // NOTE: Inputs have the "data-regexp" attribute.
        // They use this regexp in the "validate" method.
        username.validate();
        password.validate();
        
        if (username.isValid() && password.isValid()) {
            const data = {
                username:  username.getValue(),
                password:  password.getValue(),
                checkbox1: checkbox1.getState(),
                checkbox2: checkbox2.getState()
            };

            console.log(data);
        }
    });
});
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999px

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