Academy
Sprint 1: Days 01–1012 Coding ChallengesSprint 1: HTML Coding Practical Concept Test
Diagnose practical code snippets, fix W3C specification violations, and master production-grade HTML5 page architecture.
Day 01 • Document StandardsSprint Day 1 • HTML5 Boilerplate
Document Type Declaration & Quirks Mode Avoidance
A junior developer creates a new webpage but forgets to add the very first line of code:
index.html
<!-- Line 1 is MISSING! -->
<html lang="en">
<head>
<title>Student Portal</title>
</head>
<body>
<h1>Welcome to NextSem Academy</h1>
</body>
</html>What happens when `<!DOCTYPE html>` is omitted from the very first line of an HTML document?
AModern browsers fall back into legacy 'Quirks Mode', rendering CSS layouts inconsistently using obsolete 1999 box-model bugs.
BThe browser refuses to open the file and displays a fatal 404 HTTP server error.
CJavaScript execution is permanently blocked on the entire operating system.
DThe page automatically converts into a PDF document.