[jira] [Created] (GUACAMOLE-918) Guacamole Display not visible under Shadow DOM

["Jonas Zeiger (Jira)" <ji...@apache.org>]

Jonas Zeiger created GUACAMOLE-918:
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             Summary: Guacamole Display not visible under Shadow DOM
                 Key: GUACAMOLE-918
                 URL: https://issues.apache.org/jira/browse/GUACAMOLE-918
             Project: Guacamole
          Issue Type: Bug
          Components: guacamole-common-js
    Affects Versions: 1.1.0
         Environment: guacamole-common-js 1.1.0 on Chromium 78
org.apache.guacamole:guacamole-common:1.0.0 on OpenJDK 11

            Reporter: Jonas Zeiger
         Attachments: guacamole-display-under-shadow-root.png

The Guacamole display doesn't show when inserted under shadow DOM.

The display is attached like this:

{code:javascript}
const wrapper = this.shadowRoot.getElementById('console-screen-wrapper');
wrapper.style.width = '' + 640 + 'px';
wrapper.style.height = '' + 480 + 'px';
this.display = wrapper.appendChild(client.getDisplay().getElement());
{code}

The display elements including canvas are present in the DOM (see DOM screenshot).

The reason seems to be the explicit canvas/layer z-index setup here:

guacamole-common.js, Guacamole.Layer()
{code:javascript}
    // Explicitly render canvas below other elements in the layer (such as
    // child layers). Chrome and others may fail to render layers properly
    // without this.
    canvas.style.zIndex = -1;
{code}

Setting canvas.style.zIndex to 0 instead of -1 makes all layers visible under shadow DOM.



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