Function getClientRect

javascript/atoms/typescript/is-displayed.ts:134–171

(elem: Element)

  }

  function getClientRect(elem: Element): Rect {
    var cachedRect = clientRectCache.get(elem);
    if (cachedRect) {
      return cachedRect;
    }

    var rect: Rect;
    var imageMap = maybeFindImageMap(elem);
    if (imageMap) {
      rect = imageMap.rect;
    } else {
      var elemTagName = typeof (elem as Element).tagName === 'string' ? (elem as Element).tagName : '';
      if (elemTagName.toUpperCase() === 'HTML') {
        var doc = (elem as Element).ownerDocument;
        // In quirks mode (no DOCTYPE), viewport dimensions come from document.body;
        // documentElement.clientWidth/Height is unreliable and can be 0.
        var sizeElem = doc.compatMode === 'CSS1Compat' ? doc.documentElement : (doc.body || doc.documentElement);
        rect = createRect(0, 0, sizeElem.clientWidth, sizeElem.clientHeight);
      } else {
        try {
          var nativeRect = (elem as Element).getBoundingClientRect();
          rect = {
            left: nativeRect.left,
            top: nativeRect.top,
            right: nativeRect.right,
            bottom: nativeRect.bottom,
            width: nativeRect.right - nativeRect.left,
            height: nativeRect.bottom - nativeRect.top,
          };
        } catch (_error) {
          rect = createRect(0, 0, 0, 0);
        }
      }
    }

    clientRectCache.set(elem, rect);
    return rect;
  }

  function getAreaRelativeRect(area: HTMLAreaElement): Rect {
    var shape = area.shape.toLowerCase();