W3 Teach
Editor
Result
`; // Init CodeMirror editor = CodeMirror.fromTextArea(document.getElementById('codeEditor'), { mode: 'htmlmixed', theme: 'dracula', lineNumbers: true, autoCloseTags: true, matchTags: true, tabSize: 2, indentWithTabs: false, lineWrapping: true, extraKeys: { 'Ctrl-Enter': runCode, 'Cmd-Enter': runCode, 'Ctrl-/': 'toggleComment' } }); editor.setSize('100%', '100%'); // Run code on load runCode(); // Auto-run on change (debounced) let autoRunTimer; editor.on('change', () => { clearTimeout(autoRunTimer); autoRunTimer = setTimeout(runCode, 1200); }); function runCode() { const frame = document.getElementById('previewFrame'); const code = editor.getValue(); let htmlContent = ''; const lang = document.getElementById('langMode').value; if (lang === 'html' || currentTab === 'html') { htmlContent = code; } else if (lang === 'css' || currentTab === 'css') { htmlContent = `

CSS applied. Add HTML to see more.

`; } else if (lang === 'javascript' || currentTab === 'js') { htmlContent = `