804889 - Any html elements having `src` attribute should support `defer`(async load), NOT only the <script>

Status: UNCONFIRMED

(Core :: DOM: Core & HTML, defect, P5)

Description

[Chen Zhixiang]

User Agent: Mozilla/5.0 (Windows NT 5.1; rv:16.0) Gecko/20100101 Firefox/16.0
Build ID: 20121010144125

Steps to reproduce:

I want to implement a async loading behavour using <frame>/<iframe>,
That is to say,
I can display contents in one frame, and PRELOAD in another frame,
Sadly,
i find that, if a <frame> is loading page by changing `src` attribute, then all other <frame>'s message loogs are blocked(I can not scroll the page)

To summerize, any html elements having `src` attribute should support `defer`(async load), NOT only the <script> element, this is a design dismiss
Perhaps the W3C is the one to blame?

Comment 1

[Boris Zbarsky [:bzbarsky]]

> i find that, if a <frame> is loading page by changing `src` attribute, then all other
> <frame>'s message loogs are blocked(I can not scroll the page)

That's.... quite odd.  Testcase?

> Perhaps the W3C is the one to blame?

Them or the whatwg would need to spec this, yes.

Comment 2

[Chen Zhixiang]

Test Case:

A Python Script to simulate slow http server:


import SimpleHTTPServer
import BaseHTTPServer
import time
import SocketServer

PORT = 8888

class MySlowHTTPRequestHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
    def do_GET(self):
        time.sleep(10)
        SimpleHTTPServer.SimpleHTTPRequestHandler.do_GET(self)

httpd = BaseHTTPServer.HTTPServer(("", PORT), MySlowHTTPRequestHandler)

print "serving at port", PORT
httpd.serve_forever()


Frames load test html:
<frameset cols="50%,50%">
    <frame src="http://localhost:8888/1.html"/>
    <frame src="2.html"/>
</frameset>

1.html & 2.html:
<div style="width:100%; height:2000px;">
    test
</div>

Comment 3

[Chen Zhixiang]

Sorry, i have to confess: it is NOT blocked in current Firefox 16, which uses multi-process arch.

i test this in QtWebKit (ver 4.8.0) which is an old Single process browser built on WebKit

But the problem still quotes:
   W3C seems to NOT considering a `defer` or `async` with the `src` loading attribute. I can not find a way to blame W3C, But mozilla's bugzilla seems a good place for discuss.

3x!

Comment 4

[Firefox Bug Husbandry Bot]

https://bugzilla.mozilla.org/show_bug.cgi?id=1472046

Move all DOM bugs that haven't been updated in more than 3 years and has no one currently assigned to P5.

If you have questions, please contact :mdaly.