📖 Xenia

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4-byte UTF-8: 𝕳𝖊𝖑𝖑𝖔 😀 (breaks MySQL utf8 vs utf8mb4)
Null byte: Hello\x00World
Invalid UTF-8 sequences: \xC0\x80 (overlong encoding)
Lone surrogate: \uD800

<script>alert('xss')</script>
<img src=x onerror=alert(1)>
<b>unclosed bold
"><svg/onload=alert(1)>
<a href="javascript:alert(1)">click</a>
{{7*7}} ← template injection probe (shows 49 if vulnerable)
${7*7} ← same for JS template / EL

Zalgo: Z̸̧̛͉̼̽̔a̶̡͇̎l̷̰̈g̶̙̈o̷͖͐ (combining marks — can overflow line height)
RTL override: txet siht daer nac uoy fi (U+202E flips text direction)
Bidi mix: Hello مرحبا 123 world (LTR/RTL mixing)
Zero-width: He​llo​the​re (U+200B invisible — looks like "Hello there" but breaks search)

✨ Hello from a happy visitor! ✨

𝐁𝐨𝐥𝐝: Thanks for the wonderful guestbook!
𝘐𝘵𝘢𝘭𝘪𝘤: This place is lovely.
𝕯𝖔𝖚𝖇𝖑𝖊-𝖘𝖙𝖗𝖚𝖈𝖐: Greetings to everyone!
Ⓜⓞⓝⓞⓢⓟⓐⓒⓔ ⓢⓣⓨⓛⓔ: Keep up the great work!

🌍 Languages: Hello · Hola · Bonjour · Здравствуйте · こんにちは · 你好 · مرحبا · שלום · 안녕하세요

Emojis: 😀 🎉 🚀 ☕ 🌸 🎸 🐱 ⭐

Symbols: ♠ ♥ ♦ ♣ ♫ ✓ ✗ → ← ↑ ↓ ∞ ± ≈ € £ ¥

Have a great day! ⌘(￣▽￣)⌘

Kilroy was here. Hey, another Common Lisp web site!

My first web application

hello

Multi
line
message

Hello World