We have already figured out how to clone elements. Let’s return to our main task. We are continuing to work on the to-do list. We need to add new tasks to the list by clicking on the “Add new task” button.
We already found a task template and wrote it to the newItemTemplate variable. Let’s try to clone this template and write a copy to a new variable. Output the copy to the console to make sure that the copying operation works. We will use deep cloning to save all the elements in the task structure.
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Minimum of boring theory and lots of practical tasks."><meta name="twitter:image" property="og:image" content="https://htmlacademy.org/og/htmlacademy.png"><meta name="twitter:card" content="summary_large_image"><link rel="canonical" href="https://htmlacademy.org/courses/javascript-browser/dom/clone-element-5"><meta name="theme-color" content="#2f358f"></head><body class="course-interface course-interface--light" data-base="/assets/courses/31/"><header class="page-header page-header--course"><div class="page-header__inner"><div class="page-header__top"><a class="page-header__logo" href="/" aria-label="HTML Academy Home"><img src="https://assets.htmlacademy.org/img/logo--small.svg?cs=1218aec0be4a5f23db79ad29a14e30f7f9fb9a25" width="24" height="36" alt="HTML Academy"></a><nav class="main-nav main-nav--mini" role="navigation"><div class="main-nav__course-nav"><a class="main-nav__course-item main-nav__course-button main-nav__course-button--prev" href="/courses/javascript-browser/dom/clone-element-4">Cloning and inserting elements, part 4</a><div class="main-nav__course-item main-nav__course-list main-nav__course-list--collapsed"><b class="main-nav__course-title">Working with DOM</b><span class="main-nav__course-stat">18/23</span><div class="main-nav__course-contents"><a class="main-nav__course-contents-link" href="/courses/javascript-browser/dom">Back to the list of tasks</a><ul class="main-nav__course-contents-list"><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/to-do-list">1. What are you planning to do?</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/change-event">2. The “change” event</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/change-event-2">3. How the “change” event works</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/delete-element">4. Deleting the element from the list</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/check-collection-length">5. How to check the collection length</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/debug-code">6. Debugging the code</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/static-live-collection">7. Static and live collections</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/display-message">8. Displaying the message on the page</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/submit-event">9. The “submit” event</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/cancel-form-submit">10. Cancelling the form submission</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/obtain-text-input">11. How to obtain text from the input field</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/template-tag">12. Templates and the <template> tag</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/document-fragment">13. The contents of the <template> tag, document-fragment</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/clone-element">14. Cloning and inserting elements, part 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/clone-element-2">15. Cloning and inserting elements, part 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/clone-element-3">16. Cloning and inserting elements, part 3</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/clone-element-4">17. Cloning and inserting elements, part 4</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/javascript-browser/dom/clone-element-5">18. How to clone elements</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/add-new-element">19. Adding a new element to a list</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/delete-new-task">20. Deleting a new task in the list</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/clear-input">21. Clearing the input field</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/summary">22. Summary of “Actions with DOM”</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/dom/instant-messanger">23. The third program: “Instant messenger”</a></li></ul></div></div><a class="main-nav__course-item main-nav__course-button main-nav__course-button--next" href="/courses/javascript-browser/dom/add-new-element">Adding a new element to a list</a></div><ul class="main-nav__list main-nav__list--user main-nav__list--user-guest"><li class="main-nav__item" itemprop="name"><a class="main-nav__link" href="/signup?redirect_url=%2Fcourses%2Fjavascript-browser%2Fdom%2Fclone-element-5" title="Sign up" data-modal="open" data-value="register" itemprop="url"><span class="main-nav__icon" aria-hidden="true"><svg aria-hidden="true"><use xlink:href="/img/sprites/general.svg#user"></use></svg></span>Sign up</a></li><li class="main-nav__item main-nav__item--login" itemprop="name"><a class="main-nav__link" href="/login?redirect_url=%2Fcourses%2Fjavascript-browser%2Fdom%2Fclone-element-5" title="Log in" data-modal="open" data-value="login" itemprop="url"><span class="main-nav__icon" aria-hidden="true"><svg 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fill="#EFA75B"/><path d="M31.963 50.968c-.197-.004-.358-.157-.372-.353-.018-.207.158-.378.364-.354 3.245-.26 3.505-2.156 3.608-2.25-.006-.19.183-.325.362-.26.193.01.35.16.363.354 0 .084 0 1.906 3.422 2 .192.008.348.16.362.353-.018.19-.172.34-.363.353-1.352.11-2.68-.4-3.61-1.386-.095-.096-.16-.22-.185-.353-.982 1.174-2.423 1.866-3.952 1.898z" fill="#151841"/><path d="M32.14 43.427c.186-.52 3.608.083 3.608.083s2.975-.688 3.422.084c-.05.288-.175.557-.363.78-.515-.056-1.037.004-1.525.178-.333.61-.488 1.304-.446 2-.222.394-.574.7-.995.864-.398-.112-.75-.354-.994-.688.047-.75-.146-1.496-.55-2.13-.27-.26-1.264.084-1.626-.083l-.53-1.088zm6.89.242c-.05.286-.175.556-.363.78-.503-.063-1.015-.012-1.497.148-.333.612-.487 1.305-.446 2-.222.394-.574.7-.995.864-.4-.112-.75-.354-.996-.688.053-.76-.14-1.515-.55-2.157-.268-.26-1.263.084-1.626-.084-.26-.23-.45-.53-.55-.864" fill="#CF4A27"/><path d="M35.748 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2.334.725-.13.837-1.46.93-2.13h.112c.937.492 1.647 1.33 1.98 2.334-.388.176-.793.31-1.21.4zm18.365-2.864c-1.104-.145-2.215-.232-3.33-.26-.546-.01-1.093.05-1.626.176-1.166.483-2.08 1.425-2.53 2.604l-.158.79 1.795.623c.558.153 1.132.24 1.71.26h.28c3.245-.177 4.137-3.72 4.137-3.72l.084-.353zm-1.264 1.86c-.54 1.394-2.882 1.646-2.966 1.646-.517-.02-1.03-.11-1.525-.26-.186-.085-.633-.26-1.08-.43.374-.966 1.117-1.746 2.065-2.165 0 .68.158 1.953.81 2.083.65.13.613-1.535.566-2.26.934.005 1.865.064 2.79.177-.11.316-.473.65-.66 1.17z" fill="#151841"/><path d="M19.26 39.27c.535 1.362 1.56 2.473 2.874 3.115.534.312 1.204-.07 1.207-.69.002-.285-.15-.55-.397-.695-.918-.46-1.65-1.222-2.073-2.158-.344-.957-1.972-.52-1.61.428zm29.45 3.125c1.083-.59 2.01-1.428 2.706-2.446.3-.556-.112-1.228-.743-1.21-.293.007-.56.17-.698.428-.568.776-1.306 1.412-2.158 1.86-.394.23-.517.742-.27 1.125.263.376.773.482 1.163.242z" fill="#EFA75B" stroke-width="13"/><path d="M16.025 32.436c1.525-1.386 2.427-4.408 2.79-6.835-.084.354 2.613.43 4.138-1.208 1.078-1.125.446-2-.186-3.375-1.71-3.552-4.585-6.323-7.384-8.918-.716-.69-1.44-2.428-2.706-2-.995.353-.93 3.2-.716 4.073 1.09 7.448 4.065 18.263 4.065 18.263zm37.372-.78c-1.704-1.826-2.822-4.12-3.208-6.585 0 .354-2.614.354-4.056-1.29-.995-1.127-.362-1.86.363-3.117 1.86-3.198 4.863-5.718 7.746-8.136.81-.604 1.627-1.47 2.79-.93.994.428.715 2.334.548 3.115-1.083 5.72-2.48 11.376-4.183 16.943z" fill="#FFF"/><path d="M53.564 20.422c-1.98.51-4.138 1.636-5.105 3.487-.43-2.196 1.645-4.65 3.393-5.832.333-.21.312-.703-.037-.886-.162-.085-.357-.076-.512.022-2.157 1.562-4.417 4.5-3.784 7.188.076.262.354.41.614.325l-.075.28c-.085.603.93.864.994.26.446-2.158 2.706-3.376 4.77-3.897.372-.076.522-.526.27-.81-.133-.15-.342-.204-.53-.138zM17.457 18.06c-.55-.354-.995.428-.55.865 1.433 1.004 3.182 3.05 3.395 4.956-.93-1.86-3.05-2.975-5.105-3.486-.386-.005-.633.41-.445.747.042.076.103.14.176.184 2.073.52 4.324 1.73 4.77 3.896.106.328.5.46.78.26.273.192.653.06.745-.26.735-2.66-1.6-5.728-3.766-7.16z" fill="#F1662A"/></svg></span><p class="course-loading-overlay__message"><b class="course-loading-overlay__message-title">Loading…</b><br><span class="course-loading-overlay__message-text">Everything will be ready in few seconds</span></p></div></div><div class="course-layout__sidebar course-theory"><div class="course-theory__inner course-theory__inner--left-stub"><button class="course-theory__close icon-close icon-close--light" type="button">Close</button><ul class="course-tabs course-tabs--non-interactive course-layout__theory-heading js--theory-tabs"><li class="course-tabs__item course-tabs__item--external course-tab course-tab--centered"><span class="course-tab__icon"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-theory"></use></svg></span><span class="course-tab__title">Theory</span></li><li class="course-tabs__item course-tabs__item--internal course-tab course-tab--centered course-tab--active js--theory-tab__theory"><span class="course-tab__icon"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-theory"></use></svg></span><span class="course-tab__title">Theory</span></li><li class="course-tabs__item course-tabs__item--internal course-tab course-tab--centered js--theory-tab__comments"><span class="course-tab__icon"><svg aria-hidden="true" style="width: 16px; height: 16px; fill: #2e2c9c;"><use xlink:href="/img/sprites/up.svg#comment"></use></svg></span><span class="course-tab__title">Comments</span></li></ul><section class="course-theory__content"><div class="js--theory-pane__theory course-theory__content-inner"><h1 class="course-theory__content-heading">How to clone elements</h1><div class="course-theory__content-text"><p>We have already figured out how to clone elements. Let’s return to our main task. We are continuing to work on the to-do list. We need to add new tasks to the list by clicking on the “Add new task” button.</p><p>We already found a task template and wrote it to the <code>newItemTemplate</code> variable. Let’s try to clone this template and write a copy to a new variable. Output the copy to the console to make sure that the copying operation works. We will use deep cloning to save all the elements in the task structure.</p></div></div><div class="js--theory-pane__comments hidden course-theory__content-inner"><div class="course-theory__content-text"><h2 class="course-theory__content-heading">Comments</h2><div id="disqus_thread"></div><script>
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var disqus_config = function () {
this.page.url = "https://htmlacademy.org/courses/javascript-browser/dom/clone-element-5";
this.page.identifier = "task-598";
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var d = document, s = d.createElement('script');
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</script><noscript>Please enable JavaScript to view the <a href="https://disqus.com/?ref_noscript">comments powered by Disqus.</a></noscript></div></div></section><div class="course-theory__controls"><button class="button button--close" type="button">To the task</button></div></div></div><div class="course-layout__column course-layout__column--left"><ul class="js--course-tabs course-tabs course-layout__course-tabs"><li class="js--editor-tab course-tabs__item course-tab course-tabs__item--limited course-tabs__item--limited-large course-tab--active" data-editor="html"><span class="course-tab__title course-tab__title--indent"><span class="course-tab__title-part course-tab__title-part--active">index.html</span></span><button class="js--editor-split course-tab__button course-tab__button--split" type="button"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-split"></use></svg><span class="tooltip tooltip--light tooltip--to-top tooltip--with-wrap tooltip--short course-tab__tooltip"><span class="tooltip__wrap">Split mode</span></span></button></li><li class="js--editor-tab course-tabs__item course-tab course-tabs__item--limited course-tabs__item--limited-large" data-editor="css"><span class="course-tab__title course-tab__title--indent"><span class="course-tab__title-part course-tab__title-part--active">style.css</span></span><button class="js--editor-split course-tab__button course-tab__button--split" type="button"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-split"></use></svg><span class="tooltip tooltip--light tooltip--to-top tooltip--with-wrap tooltip--short course-tab__tooltip"><span class="tooltip__wrap">Split mode</span></span></button></li><li class="js--editor-tab course-tabs__item course-tab course-tabs__item--limited course-tabs__item--limited-large" data-editor="js"><span class="course-tab__title course-tab__title--indent"><span class="course-tab__title-part course-tab__title-part--active">script.js</span></span><button class="js--editor-split course-tab__button course-tab__button--split" type="button"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-split"></use></svg><span class="tooltip tooltip--light tooltip--to-top tooltip--with-wrap tooltip--short course-tab__tooltip"><span class="tooltip__wrap">Split mode</span></span></button></li></ul><div class="course-layout__editors"><div class="js--editor course-editor course-layout__editor" id="" data-tab="html" data-split=""><span class="course-editor__label"><span class="course-editor__label-item">HTML</span><button class="course-editor__label-item course-editor__label-item--interactive hidden js--editor__unsplit-button course-editor__label-item--simple" title="No split" type="button"><svg width="7" height="10" viewBox="0 0 7 10" xmlns="http://www.w3.org/2000/svg"><g stroke="currentColor" fill="none" fill-rule="evenodd"><path stroke-linecap="round" d="M.6 3.503L3.443.518l2.842 2.985"></path><path d="M3.5 1.5v7.16" stroke-linecap="square"></path></g></svg></button></span><div class="course-editor__item" id="html-editor"><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>The To-Do List</title>
<link href="style.css" rel="stylesheet">
</head>
<body>
<h1 class="visually-hidden">The To-Do List</h1>
<ul class="todo-list">
</ul>
<p class="empty-tasks">All of the tasks have been completed. There are no new tasks.</p>
<form class="add-form" action="https://echo.htmlacademy.ru/courses" method="post">
<input class="add-form-input" type="text" placeholder="For example, buy an elephant" value="Go on a date" required>
<button class="add-form-button" type="submit">Add new task</button>
</form>
<template id="task-template">
<li class="todo-list-item">
<label>
<input type="checkbox" class="todo-list-input">
<span></span>
</label>
</li>
</template>
<script src="script.js"></script>
</body>
</html>
</div></div><div class="js--editor course-editor course-layout__editor course-editor--hidden" id="" data-tab="css" data-split=""><span class="course-editor__label"><span class="course-editor__label-item">CSS</span><button class="course-editor__label-item course-editor__label-item--interactive hidden js--editor__unsplit-button course-editor__label-item--simple" title="No split" type="button"><svg width="7" height="10" viewBox="0 0 7 10" xmlns="http://www.w3.org/2000/svg"><g stroke="currentColor" fill="none" fill-rule="evenodd"><path stroke-linecap="round" d="M.6 3.503L3.443.518l2.842 2.985"></path><path d="M3.5 1.5v7.16" stroke-linecap="square"></path></g></svg></button></span><div class="course-editor__item" id="css-editor">@font-face {
font-weight: 400;
font-family: "Muller";
font-style: normal;
font-display: swap;
src: url("fonts/Muller.woff") format("woff");
}
body {
margin: 40px 32px;
font-size: 18px;
line-height: normal;
font-family: "Muller", sans-serif;
}
.visually-hidden,
.todo-list-input {
position: absolute;
width: 1px;
height: 1px;
margin: -1px;
padding: 0;
overflow: hidden;
white-space: nowrap;
border: 0;
clip: rect(0 0 0 0);
clip-path: inset(100%);
}
.hidden {
display: none;
}
.todo-list {
margin: 0;
padding: 0;
list-style: none;
}
.todo-list-item {
margin-bottom: 12px;
}
.todo-list-item label {
display: block;
padding: 12px 18px;
background-color: #ffffff;
border-radius: 4px;
box-shadow: 0 2px 5px rgba(0, 0, 0, 0.15);
cursor: pointer;
user-select: none;
}
.todo-list-item span {
display: flex;
align-items: center;
}
.todo-list-input + span::before {
content: "";
display: inline-block;
width: 16px;
height: 16px;
margin-right: 16px;
background-color: #ffffff;
border: 2px solid #69b253;
border-radius: 4px;
}
.todo-list-input:checked + span::before {
background-color: #69b253;
background-image: url("check-white.svg");
background-repeat: no-repeat;
background-position: center;
}
.todo-list-input:not(:checked):hover + span::before,
.todo-list-input:not(:checked):focus + span::before {
background-color: rgba(105, 178, 83, 0.2);
}
.empty-tasks {
color: #69b253;
}
.empty-tasks::before {
content: "";
width: 14px;
height: 13px;
margin-right: 13px;
background-image: url("check-green.svg");
background-repeat: no-repeat;
background-position: center;
}
.add-form {
display: flex;
}
.add-form-input {
flex-grow: 1;
box-sizing: border-box;
height: 46px;
margin-right: 16px;
padding: 12px;
font: inherit;
border: 1px solid #a1b5c4;
border-radius: 4px;
}
.add-form-input:focus {
border: 1px solid #69b253;
outline: none;
}
.add-form-input:hover {
box-shadow: 0 0 6px rgba(105, 178, 83, 0.6);
}
.add-form-input::placeholder {
color: #a1b5c4;
}
.add-form-button {
flex-shrink: 0;
padding: 12px;
font: inherit;
color: #ffffff;
background-color: #69b253;
border: none;
border-radius: 4px;
user-select: none;
touch-action: manipulation;
}
.add-form-button:hover,
.add-form-button:focus {
background-color: #5aa045;
outline: none;
}
.add-form-button:active {
background-color: #42862e;
}
</div></div><div class="js--editor course-editor course-layout__editor course-editor--hidden" id="" data-tab="js" data-split=""><span class="course-editor__label"><span class="course-editor__label-item">JavaScript</span><button class="course-editor__label-item course-editor__label-item--interactive hidden js--editor__unsplit-button course-editor__label-item--simple" title="No split" type="button"><svg width="7" height="10" viewBox="0 0 7 10" xmlns="http://www.w3.org/2000/svg"><g stroke="currentColor" fill="none" fill-rule="evenodd"><path stroke-linecap="round" d="M.6 3.503L3.443.518l2.842 2.985"></path><path d="M3.5 1.5v7.16" stroke-linecap="square"></path></g></svg></button></span><div class="course-editor__item" id="js-editor">var list = document.querySelector('.todo-list');
var items = list.children;
var emptyListMessage = document.querySelector('.empty-tasks');
var newItemForm = document.querySelector('.add-form');
var newItemTitle = newItemForm.querySelector('.add-form-input');
var taskTemplate = document.querySelector('#task-template').content;
var newItemTemplate = taskTemplate.querySelector('.todo-list-item');
var toggleEmptyListMessage = function () {
if (items.length === 0) {
emptyListMessage.classList.remove('hidden');
}
};
var addCheckHandler = function (item) {
var checkbox = item.querySelector('.todo-list-input');
checkbox.addEventListener('change', function () {
item.remove();
toggleEmptyListMessage();
});
};
for (var i = 0; i < items.length; i++) {
addCheckHandler(items[i]);
}
newItemForm.addEventListener('submit', function (evt) {
evt.preventDefault();
var taskText = newItemTitle.value;
// Declare a variable task here
});
</div></div></div><div class="course-editor-controls"><button class="course-editor-controls__item course-editor-controls__item--answer" type="button">Show the answer</button></div><div class="js--feedback course-unhappy"><button class="js--feedback-btn course-unhappy__button" type="button"><span class="sr-only">Complain</span><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#unhappy"></use></svg></button><div class="js--feedback-modal course-unhappy__modal course-unhappy__modal--step-one"><form method="POST" action="/courses/javascript-browser/dom/clone-element-5/signal" class="course-unhappy__form form"><input type="hidden" name="csrf_name" value="csrf69aebc8d1803c"><input type="hidden" name="csrf_value" value="cc73bb8b6e55dd903fd22f148900a4ae"><p class="course-unhappy__text">What didn’t you like in this task?</p><div class="course-unhappy__slide"><div class="course-unhappy__wrap"><div class="course-unhappy__list"><label class="checkbox checkbox--small"><input class="checkbox__input" name="problems" value="1" type="checkbox"><span class="checkbox__text">The code check doesn’t work</span></label><label class="checkbox checkbox--small"><input class="checkbox__input" name="problems" value="2" type="checkbox"><span class="checkbox__text">The task is too difficult</span></label><label class="checkbox checkbox--small"><input class="checkbox__input" name="problems" value="3" type="checkbox"><span class="checkbox__text">The theory is hard to understand</span></label><label class="checkbox checkbox--small"><input class="js--feedback-other-checkbox checkbox__input" name="problems" value="0" type="checkbox"><span class="checkbox__text">Other (will write below)</span></label></div><div class="course-unhappy__message"><label class="sr-only" for="id-message">Другое (сейчас напишу)</label><textarea class="field field--area" id="id-message" name="message" placeholder="For example, a typo in the word «heading»"></textarea></div></div></div><button class="course-unhappy__control course-unhappy__control--prev" type="button"><span class="sr-only">Prev</span><svg aria-hidden="true"><use xlink:href="/img/sprites/landings.svg#arrow"></use></svg></button><button class="course-unhappy__control course-unhappy__control--next" type="button" disabled><span class="sr-only">Next</span><svg aria-hidden="true"><use xlink:href="/img/sprites/landings.svg#arrow"></use></svg></button><button class="js--submit-btn button" disabled>Submit</button></form><p class="course-unhappy__result hidden">Thanks! We’ll fix everything at once!</p></div></div></div><div class="course-layout__column course-layout__column--right"><span class="course-separator-control"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-arrows-separator"></use></svg></span><div class="course-browser course-layout__browser"><div class="course-browser__menu"><span class="course-browser__menu-item course-browser__address"><span class="course-browser__menu-item-inner"><span class="course-browser__address-text"></span></span></span><button class="js--autorun course-browser__menu-item course-browser__menu-button course-browser__menu-button--text-with-icon course-browser__menu-button--autorun course-browser__menu-button--autorun-on" title="Autorun" type="button"><span class="course-browser__menu-item-inner"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-autorun"></use></svg>
Autorun
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