Composer Reference Guide R2-2026-2.6.9642.28010

Web Page (Chromium, Windows, WebGL)

Web Page (Chromium, Windows, WebGL) input properties for Script Engine. Renders a web page with WebGL/3D content into Composer using an embedded Chromium browser, on Windows. Useful for live data overlays, animated lower-thirds and tickers, three-dimensional graphics or motion graphics templates, scoreboard widgets backed by an HTTP API, or any HTML/JS scene that needs hardware-accelerated rendering. Supports plain HTTP/HTTPS URLs and local HTML files (resolved against the project's media search paths). The page can post messages back via a JavaScript callback, optionally wait for a load-finalized signal before going live, and reload itself automatically on errors.

Property Type Access Description
ShowAdvancedOptions bool get/set Reveal seldom-used properties in the editor. [default=false]. Turn on to expose advanced/optional fields hidden from the default view.
AutoStart bool get/set Start rendering the page automatically when the project is loaded. [default=true]. Turn off if you want to start the renderer manually with StartCommand or from a script.
WebPageRendererUrl string get/set URL of the page to render. Accepts http:// and https:// URLs as well as local HTML files (absolute, file://, or relative paths resolved against the project's media search paths). Setting this while the renderer is running triggers a load of the new URL; setting it to an empty string clears the page to about:blank.
ReloadCommand Command get Reload the current WebPageRendererUrl from scratch. Useful when the page content has changed on the server, or to recover from a stuck state.
BrowserLoadState BrowserLoadState get Current load state of the embedded browser (read-only). Idle, Loading, WaitingForLoadFinalizer, Loaded or ErrorLoading. Read this from a script to wait until the page is fully ready before triggering downstream actions.
Width int get/set Width of the rendered page output, in pixels. [min=32, max=4096, default=1024]. Match the size your page is designed for to avoid scaling. Locked while the renderer is running.
Height int get/set Height of the rendered page output, in pixels. [min=32, max=4096, default=360]. Match the size your page is designed for to avoid scaling. Locked while the renderer is running.
AutoReloadPageOnError bool get/set Reload the page automatically if it fails to load or hits an error. [default=false]. Useful for unattended scenes where transient network issues should not leave a blank graphic on screen.
EnableConsoleLogging bool get/set Forward console.log messages from the page to the Composer log. [default=false]. Turn on while developing or debugging a page; turn off in production to keep logs quiet.
StartCommand Command get Start the embedded browser and begin rendering the page at WebPageRendererUrl. Width and Height become locked while the renderer is running.
StopCommand Command get Stop the embedded browser and release its resources. Width and Height become editable again.
VideoQueueSize int get Number of rendered frames waiting in the output queue (read-only). Steady low values indicate a healthy renderer; growing values mean the page produces frames faster than they are consumed.
PageRenderPerformance string get Average time taken to render one frame from the page, formatted as text in milliseconds (read-only). Useful for spotting heavy pages — values that approach the frame interval indicate the page is too slow to render in real time.
RenderStart DateTime get Time the current rendering session started (read-only, debug).
FramesRendered long get Total frames rendered since the current session started (read-only, debug).
Fps int get Effective frames-per-second of the page renderer (read-only, debug). Computed from FramesRendered and time since RenderStart.

Inherits from: AbstractInput, AbstractAudioProcessing, AbstractAudioMetering.

See also: Web Page (Chromium, Windows, WebGL) in Inputs — user-facing introduction, screenshots, and section summaries.