Constant DOM_EXTRACT_JS 

pub const DOM_EXTRACT_JS: &str = r#"
(() => {
  const interactive = 'a, button, input, textarea, select, [role="button"], [onclick], [tabindex], [data-testid], [aria-label]';
  const els = document.querySelectorAll(interactive);
  const info = [];
  const seen = new Set();
  els.forEach((el, i) => {
    const rect = el.getBoundingClientRect();
    if (rect.width === 0 || rect.height === 0) return;
    const tag = el.tagName.toLowerCase();
    let selector = '';
    if (el.id) selector = '#' + CSS.escape(el.id);
    else if (el.getAttribute('data-testid')) selector = '[data-testid="' + el.getAttribute('data-testid') + '"]';
    else if (el.name) selector = '[name="' + CSS.escape(el.name) + '"]';
    else if (el.className && typeof el.className === 'string') {
      const cls = el.className.trim().split(/\\s+/)[0];
      if (cls) selector = tag + '.' + CSS.escape(cls);
    }
    if (!selector) selector = tag;
    if (seen.has(selector)) return;
    seen.add(selector);

    let label = '';
    const aria = el.getAttribute('aria-label');
    if (aria) {
      label = aria;
    } else if (tag === 'input' || tag === 'textarea' || tag === 'select') {
      label = el.placeholder || el.name || el.getAttribute('aria-label') || '';
      if (el.type && !label) label = el.type;
    } else {
      label = (el.textContent || '').trim().substring(0, 80);
    }

    info.push(i + ': ' + selector + ' [' + tag + '] "' + label + '"');
  });
  return JSON.stringify(info);
})()
"#;

JavaScript to extract interactive elements from the current page. Returns a JSON array of objects with tag, selector, and label.