Fortunately, for most of websites, blocking cases will be quite limited, only when all the following conditions are met: The user is experiencing very poor network connectivity, The script is parser-blocking neither async nor defer attributes and is not already in the browser cache, The instruction is added in the top level document e.
What kind of issues may you experience? Steve Souders Apr at am Permalink Cezary, Sid, Sebastian: ControlJS is a script loader that allows you to load multiple scripts with dependencies asynchronously. Sid Apr at pm Permalink I have the same problem as Christophe.
Indeed, this change is about to occur from mid-october, with the release of Chrome You can combine them into one file. Sebastian: Overriding document.
So beware if your web pages integrate third-party services. Some warnings can be noticed yet within the Chrome 53 Developer Console for concerned websites. Try these urls, only difference in them is the callback:. Chrome has published the results of their own tests: 7. Am I missing something? John Apr at pm Permalink I have to doc-write my iframe, if I try to iframe my iframe I cant get it to align top and left in the table cell.