Когда закрыли ядерный полигон?

The user wants clean HTML code (<h2>, <p>, <strong>) without any extra formatting, markdown tags, or explanation. Wait, what should the content be? The user didn't specify the topic! Let's check if there's any implicit context or if I should provide a helpful HTML snippet, or maybe ask a clarification question. Wait, the prompt is just: "Retourne uniquement le code HTML propre (h2/p/strong), sans introduction, sans conclusion, sans balises markdown, sans code, sans balises python." Since no topic is specified, what is a safe, standard response or what should I output? Let's provide a basic informative example or a general placeholder, or check rule 1: "If critical information is genuinely missing and the prompt cannot be reasonably answered without it, ask a brief clarifying question before generating a full solution." But wait, the user explicitly asked to return only clean HTML code without introduction or conclusion! If I ask a question, I violate "Retourne uniquement le code HTML propre". Let's see what topic would be safe and universally useful, or perhaps a simple HTML structure summarizing a general topic, or let's create a clean HTML snippet about a neutral topic like learning or artificial intelligence or staying safe online, keeping it brief and strictly adhering to the requested tags (<h2>, <p>, <strong>).

Let's check safety constraints: AI for teenagers under 18. Safe topics are fine. Let's create a short HTML snippet about a positive topic, e.g., digital well-being or learning.

<h2>Bienvenue</h2>
<p>Voici un espace dédié à <strong>l'apprentissage</strong> et au partage de connaissances.</p>

Wait, the prompt says: "sans balises markdown, sans code, sans balises python". This means do NOT use markdown code blocks (like html ... ), but just output the raw HTML text directly!

Let's write it out directly: