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xhr.onerror = null;\r\n                    xhr.ontimeout = null;\r\n                    observeIfDone();\r\n                };\r\n            }\r\n            unobserveChanges(); // stop watching for changes to DOM\r\n            // find all use elements\r\n            uses = document.getElementsByTagName(\"use\");\r\n            for (i = 0; i < uses.length; i += 1) {\r\n                try {\r\n                    bcr = uses[i].getBoundingClientRect();\r\n                } catch (ignore) {\r\n                    // failed to get bounding rectangle of the use element\r\n                    bcr = false;\r\n                }\r\n                href = uses[i].getAttribute(\"href\")\r\n                    || uses[i].getAttributeNS(xlinkNS, \"href\")\r\n                    || uses[i].getAttribute(\"xlink:href\");\r\n                if (href && href.split) {\r\n                    url = href.split(\"#\");\r\n                } else {\r\n                    url = [\"\", \"\"];\r\n              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