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script: Implement document's active sandboxing flag set (#39079)

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Implements document's active sandboxing flags. These are currently
populated only from CSP-derived sandboxing flags for a new document,
when defined in the CSP.

Testing: 1 new pass, and some new wpt's are added to test points in the
spec where these flags influence behaviour.

Signed-off-by: Shane Handley <shanehandley@fastmail.com>
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shanehandley 2025-09-05 15:02:23 +10:00 • committed by GitHub
parent f722419861
commit 989c0d8994
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10 changed files with 156 additions and 15 deletions
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31
components/script/dom/html/htmlmediaelement.rs
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@ -10,6 +10,7 @@ use std::time::{Duration, Instant};
use std::{f64, mem};
use compositing_traits::{CrossProcessCompositorApi, ImageUpdate, SerializableImageData};
use content_security_policy::sandboxing_directive::SandboxingFlagSet;
use dom_struct::dom_struct;
use embedder_traits::{MediaPositionState, MediaSessionEvent, MediaSessionPlaybackState};
use euclid::default::Size2D;
@ -717,11 +718,8 @@ impl HTMLMediaElement {
}
if ready_state == ReadyState::HaveEnoughData {
// TODO: Check sandboxed automatic features browsing context flag.
// FIXME(nox): I have no idea what this TODO is about.
// FIXME(nox): Review this block.
if self.autoplaying.get() && self.Paused() && self.Autoplay() {
if self.eligible_for_autoplay() {
// Step 1
self.paused.set(false);
// Step 2
@ -968,6 +966,31 @@ impl HTMLMediaElement {
}
}
/// <https://html.spec.whatwg.org/multipage/#eligible-for-autoplay>
fn eligible_for_autoplay(&self) -> bool {
// its can autoplay flag is true;
self.autoplaying.get() &&
// its paused attribute is true;
self.Paused() &&
// it has an autoplay attribute specified;
self.Autoplay() &&
// its node document's active sandboxing flag set does not have the sandboxed automatic
// features browsing context flag set; and
{
let document = self.owner_document();
!document.has_active_sandboxing_flag(
SandboxingFlagSet::SANDBOXED_AUTOMATIC_FEATURES_BROWSING_CONTEXT_FLAG,
)
}
// its node document is allowed to use the "autoplay" feature.
// TODO: Feature policy: https://html.spec.whatwg.org/iframe-embed-object.html#allowed-to-use
}
// https://html.spec.whatwg.org/multipage/#concept-media-load-resource
fn resource_fetch_algorithm(&self, resource: Resource) {
if let Err(e) = self.setup_media_player(&resource) {