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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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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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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

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

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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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

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HTML 

              
                <!DOCTYPE html>
<html lang="es">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="tareas.css">
    <title>Tareas</title>
</head>
<body>
    <h1>Lista de Tareas</h1>
    <p>
        - Aqui puedes hacer una lista de tus tareas por hacer, cada que abras la pagina puedes ver tu lista de nuevo.
    </p>
    <p>
        - Para borrar una tarea selecciónala y da click 
        en borrar.
    </p>
    <p>
        - Para dar una tarea por terminada da click sobre ella.
    </p>
   
    <div id="newGrid">
        <input id="tarea" type="text" placeholder="Escribe la tarea">
        <button id="btn-agregar">Agregar</button>
        <button id="btn-borrar">Borrar</button>
    </div>
    <ul id="lista-tareas"></ul>

<script src="tareas.js"></script>
</body>
</html>
!

CSS 

              
                body{
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: #E8E9EB;
}
h1{
    color:#F06543;
    text-align: center;
    font-size: 25px;
    
}
ul, p{
    color:#313638;
    font-size: 90%;
}
li{
    list-style-type:none;
}
button{
    background-color:#E0DFD5;
      color:#313638;
      width: 20%;
      height: 60px;
      border: 5px solid #F06543;
      float:right;
      margin-right:15%;
      margin-top: .5% 
}

#tarea{
    margin-left: 5%;
    width: 50%;
    height: 2%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
      font-size: 50px;
      margin-bottom: .5%;
      

}


@media screen 
and (max-width: 650px)
{
    #newGrid{
        display: inline-grid;
        width: 100%;
        grid-template-columns: repeat(1, 1fr);
        grid-template-rows: repeat(2,45px);
    }

    #tarea{
        grid-column: 1;
        grid-row: 1;
        width: 50%;
        height: 90%;
        margin-right: 35%;
        font-size: 100%;
        border-radius: 10px;
    }

    #btn-agregar{
        grid-column: 1;
        grid-row: 1;
        width: 30%;
        height: 90%;
        margin-left: 65%;
        border-radius: 10px;
        font-size: 120%;
    }

    #btn-borrar{
        grid-column: 1;
        grid-row: 2;
        width: 30%;
        height: 90%;
        margin-left: 65%;
        border-radius: 10px;
        font-size: 120%;
    }

    #lista-tareas{
        grid-column: 1;
        grid-row: 3;
    }
}
!

JS 

              
                var listaTareas = [];
document.getElementById('btn-borrar').onclick=borrar;
document.getElementById('btn-agregar').onclick = hacerlista;
cargaTareas();
function borrar(){
    var elementos = document.querySelectorAll('li>input');
    listaTareas2=document.getElementById('lista-tareas');
    for(var i=0;i<elementos.length;i++)
    {
        if(elementos[i].checked)
        {
            listaTareas2.removeChild(elementos[i].parentNode);
            console.log(i);
            listaTareas.splice(i,1);
        }
    }    
    localStorage.setItem('elemento', listaTareas);
    
}

function hacerlista()
{
    var Textarea = document.getElementById('tarea').value;
    agregar(Textarea);
    document.getElementById("tarea")
}

function agregar(nueva) {
   
    var elemento = document.createElement('li');
    var nodoCheck= document.createElement('input');
    nodoCheck.setAttribute('type','checkbox');
    var nodoTexto = document.createTextNode(nueva);
    elemento.appendChild(nodoCheck);
    elemento.appendChild(nodoTexto);
    var lista = document.getElementById('lista-tareas');
    lista.appendChild(elemento);
    listaTareas.push(nueva);
    localStorage.setItem('elemento', listaTareas);
    elemento.onclick = marcarTarea;
    console.log('voy agregar una tarea  ' + nueva);
}


function marcarTarea(evento) {
    evento.target.setAttribute("style","color:red");
    console.log('Tarea Completada : ' + evento.target.innerText);
}

function eliminartarea(evento) {
    
    document.getElementById('lista-tareas').removeChild(evento.target);
    var encuentra=listaTareas.indexOf(evento.target.innerText);
    if(encuentra>-1)
    {
        listaTareas.splice(encuentra,1);
    }
    localStorage.setItem('elemento',listaTareas);
    
}

function cargaTareas() {
    var nuevalistaT = [];

    if(localStorage.getItem('elemento')=="")
    {
        localStorage.clear();
    }

    if (localStorage.length > 0)
    {
       nuevalistaT = localStorage.getItem('elemento').split(',');;
    }

    for (var i = 0; i < nuevalistaT.length; i++)
    {
        agregar(nuevalistaT[i]);
    }     
}
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