| http://www.w3.org/ns/prov#value | - e) {\n throw new Error(\can not bar.\);\n})\n.fail(function (error) {\n // We get here with either foo's error or bar's error\n});\n```\n\n### Progress Notification\n\nit is possible for promises to report their progress, e.g. for tasks that take a\nlong time like a file upload.
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