From 4ae6b278099394c8488af1e8c357f3d3e1724671 Mon Sep 17 00:00:00 2001
From: Tibo De Peuter <tibo@depeuter.dev>
Date: Sat, 8 Aug 2026 17:35:53 +0200
Subject: [PATCH] Initial commit

---
 background.js |  13 +++++++
 content.css   |   6 +++
 content.js    | 100 ++++++++++++++++++++++++++++++++++++++++++++++++++
 manifest.json |  18 +++++++++
 4 files changed, 137 insertions(+)
 create mode 100644 background.js
 create mode 100644 content.css
 create mode 100644 content.js
 create mode 100644 manifest.json

diff --git a/background.js b/background.js
new file mode 100644
index 0000000..85cd086
--- /dev/null
+++ b/background.js
@@ -0,0 +1,13 @@
+browser.action.onClicked.addListener((tab) => {
+  // Inject the CSS for the hover highlight
+  browser.scripting.insertCSS({
+    target: { tabId: tab.id },
+    files: ["content.css"]
+  });
+
+  // Inject the JavaScript for the element picker
+  browser.scripting.executeScript({
+    target: { tabId: tab.id },
+    files: ["content.js"]
+  });
+});
diff --git a/content.css b/content.css
new file mode 100644
index 0000000..ed22de3
--- /dev/null
+++ b/content.css
@@ -0,0 +1,6 @@
+.pep-hover-highlight {
+  outline: 3px dashed #0088ff !important;
+  outline-offset: -3px !important;
+  cursor: crosshair !important;
+  background-color: rgba(0, 136, 255, 0.1) !important;
+}
diff --git a/content.js b/content.js
new file mode 100644
index 0000000..72757d8
--- /dev/null
+++ b/content.js
@@ -0,0 +1,100 @@
+(function() {
+  if (window.pepActive) return;
+  window.pepActive = true;
+
+  let currentHovered = null;
+
+  function handleMouseOver(e) {
+    e.stopPropagation();
+    if (currentHovered) {
+      currentHovered.classList.remove('pep-hover-highlight');
+    }
+    currentHovered = e.target;
+    currentHovered.classList.add('pep-hover-highlight');
+  }
+
+  function handleMouseOut(e) {
+    e.stopPropagation();
+    if (currentHovered) {
+      currentHovered.classList.remove('pep-hover-highlight');
+      currentHovered = null;
+    }
+  }
+
+  function handleClick(e) {
+    e.preventDefault();
+    e.stopPropagation();
+
+    // Turn off picker mode
+    document.removeEventListener('mouseover', handleMouseOver, true);
+    document.removeEventListener('mouseout', handleMouseOut, true);
+    document.removeEventListener('click', handleClick, true);
+    window.pepActive = false;
+
+    if (currentHovered) {
+      currentHovered.classList.remove('pep-hover-highlight');
+      printElement(currentHovered);
+    }
+  }
+
+  function printElement(el) {
+    el.classList.add('pep-print-target');
+
+    // Walk up the DOM tree to tag all ancestors of the target
+    let current = el.parentElement;
+    const ancestors = [];
+    while (current && current !== document.body && current !== document.documentElement) {
+      current.classList.add('pep-print-ancestor');
+      ancestors.push(current);
+      current = current.parentElement;
+    }
+
+    // Inject CSS that hides siblings of the target and siblings of its ancestors
+    const style = document.createElement('style');
+    style.textContent = `
+      @media print {
+        /* Hide all siblings of the body, ancestors, and target */
+        body > *:not(.pep-print-ancestor):not(.pep-print-target),
+        .pep-print-ancestor > *:not(.pep-print-ancestor):not(.pep-print-target) {
+          display: none !important;
+        }
+
+        /* Strip formatting from ancestors to prevent them from pushing the target around */
+        .pep-print-ancestor {
+          padding: 0 !important;
+          margin: 0 !important;
+          border: none !important;
+          background: transparent !important;
+          box-shadow: none !important;
+          position: static !important;
+          overflow: visible !important;
+        }
+
+        /* Reset body constraints */
+        body {
+          padding: 0 !important;
+          margin: 0 !important;
+          min-height: 100vh !important;
+        }
+      }
+    `;
+    document.head.appendChild(style);
+
+    // Short delay to ensure browser applies the print CSS before opening dialog
+    setTimeout(() => {
+      window.print();
+
+      // Clean up the temporary styles and classes after the print dialog closes
+      setTimeout(() => {
+        el.classList.remove('pep-print-target');
+        ancestors.forEach(a => a.classList.remove('pep-print-ancestor'));
+        style.remove();
+      }, 1000);
+    }, 100);
+  }
+
+  // Activate event listeners in the capture phase to override default page behaviors
+  document.addEventListener('mouseover', handleMouseOver, true);
+  document.addEventListener('mouseout', handleMouseOut, true);
+  document.addEventListener('click', handleClick, true);
+})();
diff --git a/manifest.json b/manifest.json
new file mode 100644
index 0000000..dcca74c
--- /dev/null
+++ b/manifest.json
@@ -0,0 +1,18 @@
+{
+  "manifest_version": 3,
+  "name": "Print Element Picker",
+  "version": "1.0",
+  "description": "Interactively pick an element on the page and print only that element.",
+  "permissions": ["activeTab", "scripting"],
+  "action": {
+    "default_title": "Pick element to print"
+  },
+  "background": {
+    "scripts": ["background.js"]
+  },
+  "browser_specific_settings": {
+    "gecko": {
+      "id": "print-picker@yourdomain.com"
+    }
+  }
+}