Rewrite half the theme to make Mozilla observatory more happy about strict CSP

static/copy-button.js

@@ -0,0 +1,57 @@
+// Based on https://www.roboleary.net/2022/01/13/copy-code-to-clipboard-blog.html
+document.addEventListener("DOMContentLoaded", function () {
+	let blocks = document.querySelectorAll("pre[class^='language-']");
+
+	blocks.forEach((block) => {
+		if (navigator.clipboard) {
+			// Code block header title
+			let title = document.createElement("span");
+			let lang = block.getAttribute("data-lang");
+			title.innerHTML = lang;
+
+			// Copy button icon
+			let icon = document.createElement("i");
+			icon.classList.add("icon");
+
+			// Copy button
+			let button = document.createElement("button");
+			let copyCodeText = document.getElementById("copy-code-text").textContent;
+			button.setAttribute("title", copyCodeText)
+			button.appendChild(icon);
+
+			// Code block header
+			let header = document.createElement("div");
+			header.classList.add("header");
+			header.appendChild(title);
+			header.appendChild(button);
+
+			// Container that holds header and the code block itself
+			let container = document.createElement("div");
+			container.classList.add("pre-container");
+			container.appendChild(header);
+
+			// Move code block into the container
+			block.parentNode.insertBefore(container, block);
+			container.appendChild(block);
+
+			button.addEventListener("click", async () => {
+				await copyCode(block, header, button); // Pass the button here
+			});
+		}
+	});
+
+	async function copyCode(block, header, button) {
+		let code = block.querySelector("code");
+		let text = code.innerText;
+
+		await navigator.clipboard.writeText(text);
+
+		header.classList.add("active");
+		button.setAttribute("disabled", true);
+
+		header.addEventListener("animationend", () => {
+			header.classList.remove("active");
+			button.removeAttribute("disabled");
+		}, { once: true });
+	}
+});