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HTML App playback

Open an XStack containing a packaged HTML App. Autostart runs it when the card opens. Use controls supplied by the stack for Start, Stop and Reload; repeated Start preserves the running app. The full Standalone provides resource, Autostart and viewport authoring controls.

Normal redraws, zoom and resize preserve the running instance. Hidden apps keep running but lose input/focus. Navigation, Reload, resource replacement and project close end the old instance; new card visits follow Autostart. Save Copy preserves settings and resources, not embedded runtime state.

Stop hides the app immediately, attempts worker/timer/blob/audio cleanup and destroys the old context on acknowledgement or after a 2 second host timeout. Pagehide flushes contexts immediately. A blocked browser thread cannot be preempted by this timer.

HAO uses persistent DOM iframe hosts and ordered SVG paint planes. Actual Safari, Chrome and Firefox require hands-on qualification; automated WebKit evidence is preliminary. HAO cards use plain navigation. The iframe remains allow-scripts only with restrictive CSP; same-origin access, storage, networking, popups, downloads and fullscreen have not been enabled.

For a missing or broken resource, ask its author to inspect it in Standalone. The package includes the HTML App authoring reference, Dev4 workflow sample and unchanged Ripple/Dev3 qualification stacks. This Final release follows accepted RC1 qualification.

Free software distributed under the GNU General Public License, version 3 or later (GPL-3.0-or-later). The complete GPLv3 is included in the release package.

STACKADIA SOFTWARE DISCLAIMER

Stackadia and the Stackadia Player are free software distributed under the GNU General Public License, version 3 or later (GPL-3.0-or-later).

To the fullest extent permitted by applicable law, Stackadia and the Stackadia Player are provided “as is,” without warranties of any kind, either express or implied. This includes, without limitation, implied warranties of merchantability and fitness for a particular purpose. You assume all risk associated with installing, operating, modifying, distributing, or otherwise using the software, including opening, running, editing, importing, exporting, or saving stacks and related files.

To the fullest extent permitted by applicable law, the copyright holders, contributors, developers, distributors, and other parties who modify or convey the software will not be liable for any damages arising from its use or inability to be used. This includes, without limitation, direct, indirect, incidental, special, exemplary, or consequential damages; loss or corruption of data; damage to hardware, software, or other systems; interruption of work; loss of profits; inaccurate results; incompatibility with other programs; or losses sustained by you or a third party, even if advised that such damages may occur.

Nothing in this notice excludes or limits liability that cannot lawfully be excluded or limited. If a written warranty or support agreement is provided separately, that agreement applies only to the extent expressly stated.

This notice summarizes, but does not replace, the warranty disclaimer and limitation of liability contained in Sections 15, 16, and 17 of the GNU General Public License version 3. The complete license is included with the software and should be consulted for its full terms.

Stackadia and the Stackadia Player may include software, source code, libraries, fonts, icons, images, audio, documentation, or other materials created by third parties and used under their respective licenses. Copyright in these materials remains with their original authors and copyright holders. Applicable attribution notices and license terms are provided in the Third-Party Notices accompanying this software.

Three.js 0.185.1 / revision 185
Includes the Three.js core/module runtime and OrbitControls addon.
Copyright © 2010–2026 Three.js authors
Licensed under the MIT License.
https://threejs.org/

The complete MIT License is included in THIRD_PARTY_NOTICES.txt.

Contains AI-generated content.