Pin-op

Pin-op connects one Chrome or Chromium window to one local VS Code window through an explicit seven-digit code. Select an element on the page or in the lazy DOM tree, then see the related CSS or source-mapped SCSS ranges highlighted in the active IDE file and inspect its DOM and Rules. Pin-op distinguishes rules for the selected element from rules for its immediate parent. Auto Refresh updates eligible styles without reloading the page and reloads the current tab with scroll restoration after changed script, Vue, PHP, or HTML saves. Chrome and Firefox use one shared Chromium-derived read-only Inspector UI. It is a BSD-licensed derivation with attribution in the package notices, and the pinned Chromium source is available in the Firefox release source archive. Only after an explicit Rules origin click may Pin-op open the exact verified CSS or original source-mapped SCSS block in VS Code using an IDE-issued opaque authority. Passive inspection never switches files, and no workspace path, full range, document version, or command crosses the bridge. The author-style pseudo preview supports `:hover` and `:focus`; it is not native forcing and provides no user-authored CSS or DOM editing operations. Pin-op does not dispatch input, focus, mouse, pointer, or keyboard events. Page scripts may observe temporary preview artifacts while enabled, and mirror styles may trigger transitions, animations, or resource loads. Controlled exits remove Pin-op-owned markers and styles. Abrupt extension termination can leave artifacts until page navigation or reload. Unsupported cases are reported rather than invented. Inaccessible stylesheet rules are unavailable and reported as PARTIAL. Cross-origin frames are unavailable, and closed shadow roots are unavailable. Unsupported `:not(:hover)` is PARTIAL; unsupported results are not guessed. The Inspector's Source tab remains active-document-only. The connection uses a loopback-only WebSocket and explicit browser-window linking, with no remote Pin-op service. Chrome/Chromium 116 or newer and the matching Pin-op VS Code extension are required. Pin-op needs its matching IDE half. Install the Pin-op extension for Visual Studio Code from https://marketplace.visualstudio.com/items?itemName=conus-vision.pin-op (extension ID conus-vision.pin-op) and keep both halves on the same release. VS Code is the only IDE this panel can link to today; support for other IDEs is in development. Pin-op by Volodymyr Moskvin (c) 2026 [Conus Vision](https://conus.vision)