- From: Ilya Grigorik <igrigorik@google.com>
- Date: Wed, 31 Jul 2013 16:48:10 -0700
- To: "Reitbauer, Alois" <Alois.Reitbauer@compuware.com>
- Cc: "public-web-perf@w3.org" <public-web-perf@w3.org>
- Message-ID: <CADXXVKqU8ROsyfRm3WSr7DnsFKcAdRtnvuy0vaJj31UKU3k+1g@mail.gmail.com>
- The monitoring JavaScript becomes a single point of failure for the page if it does not load - Modification of page source can result in unwanted side effects - The monitoring JavaScript will not be loaded when the page cannot be loaded (e.g. because of a DNS error). - It does not allow to collect performance data for non-HTML request (e.g. images, pdf downloads) The first two seem contrived.. we all know that these scripts should be loaded in an async way, and we have well defined mechanisms to do so. And isn't the last point intentional and handled by ResourceTiming? Really, it seems like the only new functionality here is point #3, which is error reporting for pages which failed to load? Which is a valid and interesting case, but having said that, do we have any idea or data on how frequently this occurs in the wild? I know this may be a chicken and the egg question, but I'm curious if the extra machinery (and another cookie-like mechanism is pretty heavy), is really warranted. ig On Mon, Jul 22, 2013 at 2:37 AM, Reitbauer, Alois < Alois.Reitbauer@compuware.com> wrote: > The first draft of the JavaScript Preflight Injection Specification is > available. The goal of this specification is to provide a reliable means > for collecting performance data in the browser without affecting page > behaviour. You can find the latest version at > http://w3c-test.org/webperf/specs/JSPreflightInjection/. Comments and > contributions are welcome. > > // Alois > The contents of this e-mail are intended for the named addressee only. It > contains information that may be confidential. Unless you are the named > addressee or an authorized designee, you may not copy or use it, or > disclose it to anyone else. If you received it in error please notify us > immediately and then destroy it. Compuware Austria GmbH (registration > number FN 91482h) is a company registered in Vienna whose registered office > is at 1120 Wien, Austria, Am Euro Platz 2 / Gebäude G. >
Received on Wednesday, 31 July 2013 23:49:17 UTC