Edit HTML, CSS and Javascript
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HTML
<div class="warning">This is a warning!</div> <div class="message">This is a message</div> <div id="js_content"></div>
CSS
.warning { color: red; }
Javascript
// Change the next line and watch the preview change var new_text = 'This text was added by js' var js_element = document.getElementById('js_content') js_element.innerHTML = new_text
Preview