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fix(script): "process the iframe attributes" shouldn't invoke the iframe load event steps anymore

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This likely originates from a bug that existed in the specification[1].
A `src`-less iframe would fire two `load` events when implemented
according to an affected version of the specification.

[1]: f2839722e1
This commit is contained in:
yvt 2021-08-03 23:45:35 +09:00
parent 3090505fd4
commit 38adb092ad
1 changed files with 18 additions and 11 deletions
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29
components/script/dom/htmliframeelement.rs
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@ -25,7 +25,6 @@ use crate::dom::virtualmethods::VirtualMethods;
use crate::dom::window::ReflowReason;
use crate::dom::windowproxy::WindowProxy;
use crate::script_thread::ScriptThread;
use crate::task_source::TaskSource;
use dom_struct::dom_struct;
use html5ever::{LocalName, Prefix};
use ipc_channel::ipc;
@ -239,6 +238,7 @@ impl HTMLIFrameElement {
/// <https://html.spec.whatwg.org/multipage/#process-the-iframe-attributes>
fn process_the_iframe_attributes(&self, mode: ProcessingMode) {
// > 1. If `element`'s `srcdoc` attribute is specified, then:
if self
.upcast::<Element>()
.has_attribute(&local_name!("srcdoc"))
@ -280,22 +280,16 @@ impl HTMLIFrameElement {
}
}
// https://github.com/whatwg/html/issues/490
if mode == ProcessingMode::FirstTime &&
!self.upcast::<Element>().has_attribute(&local_name!("src"))
{
let this = Trusted::new(self);
let pipeline_id = self.pipeline_id().unwrap();
// FIXME(nox): Why are errors silenced here?
let _ = window.task_manager().dom_manipulation_task_source().queue(
task!(iframe_load_event_steps: move || {
this.root().iframe_load_event_steps(pipeline_id);
}),
window.upcast(),
);
return;
}
// > 2. Otherwise, if `element` has a `src` attribute specified, or
// > `initialInsertion` is false, then run the shared attribute
// > processing steps for `iframe` and `frame` elements given
// > `element`.
let url = self.get_url();
// TODO(#25748):
@ -355,6 +349,19 @@ impl HTMLIFrameElement {
fn create_nested_browsing_context(&self) {
// Synchronously create a new browsing context, which will present
// `about:blank`. (This is not a navigation.)
//
// The pipeline started here will synchronously "completely finish
// loading", which will then asynchronously call
// `iframe_load_event_steps`.
//
// The precise event timing differs between implementations and
// remains controversial:
//
// - [Unclear "iframe load event steps" for initial load of about:blank
// in an iframe #490](https://github.com/whatwg/html/issues/490)
// - [load event handling for iframes with no src may not be web
// compatible #4965](https://github.com/whatwg/html/issues/4965)
//
let url = ServoUrl::parse("about:blank").unwrap();
let document = document_from_node(self);
let window = window_from_node(self);