ruffle-rs/ruffle

Html HREF buttons tied to actionscript functions are treated as external URLs.

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#23514 opened on Apr 23, 2026

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A-avm1buggood first issue

Description

Describe the bug

In all of the Submachine games HD builds, the footer controls were replaced with text buttons to control fullscreen, music, and sound fx. These buttons are all implimented as via html href like the following: <A HREF="asFunction:toggle_music" TARGET="">music: on</A> When clicking on the button, Ruffle will attempt to open these functions in an external web browser instead of executing the referenced actionscript function.

Expected behavior

As demonstrated by the flash packaged HD builds: Clicking on the buttons in the footer should execute the referenced function, not open an external browser.

Content Location

Unfortunately, I can't link directly to an affected swf as this is paid content that's still up for sale. Any of the SWF builds in the release will exhibit this behavior however. https://mateuszskutnik.itch.io/submachine-collection

Affected platform

Desktop app

Operating system

Windows 11 24H2 26100.8246

Browser

No response

Additional information

The full html footer is as follows <P ALIGN="CENTER"><FONT FACE="Arial" SIZE="10" COLOR="#444444" LETTERSPACING="0" KERNING="0"><A HREF="asFunction:toggle_full_screen" TARGET="">fullscreen: off | </A><A HREF="asFunction:toggle_music" TARGET="">music: on</A><A HREF="asFunction:toggle_full_screen" TARGET=""> | </A><A HREF="asFunction:toggle_sfx" TARGET="">sound fx: on</A></FONT></P> Do note toggle_full_screen appearing twice seems to be a bug in the game, not Ruffle as its present in the flash builds as well.

Sidenote: While the web extension version does not exhibit the same behavior, these buttons are broken on it as well. It simply does nothing when clicking on them.

Contributor guide

Tech stack
rust
Domain
desktop
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
RustRuffle internals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Investigate how Ruffle handles `<A HREF>` in HTML text fields. Look in `core/src/display object/text.rs` for URL handling. The desktop app tries to open the link externally; the web extension does nothing. The fix should intercept `asFunction:` prefix and invoke the corresponding ActionScript function. Check if `asFunction` is already recognized in other contexts.