Track

HTML APIs, Open Graph & SEO

HTML APIs, Open Graph & SEO

WebContainer
0 XP
0d streak
← Accessibility & ARIA
Concept
Core Principles
Code Example
4Knowledge Check
5Hands-On Drill
60%
Lesson 1 · 6 min

HTML APIs, Open Graph & SEO

This is a production-shaped building block. Learn the contract first, then prove your implementation against examples and edge cases.

In this lesson

STEP 1

Read the required function's inputs and output as a contract before choosing an implementation.

STEP 2

Start with the smallest correct version, then account for the boundary conditions in the specification.

STEP 3

Use the visible cases to check understanding; the gated drill also tests whether your solution generalises.

Interactive Example

A small, testable implementation pattern

Interactive Editor
typescript
Loading...
Output Console
Modify code and click "Run Code" (or ⌘+Enter) to evaluate output in real time.
What happens here?
  1. Name the input and expected output.
  2. Keep one responsibility per function.
  3. Check boundary conditions before calling the work complete.

Quick check

What should you establish before writing a solution?

Next: Phase 2 Hands-On Drill

Ready to write code?

Solve the coding challenge in the in-browser IDE with live visible and hidden specification tests.