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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/API/EXT_disjoint_timer_query/getQueryObjectEXT below:

EXT_disjoint_timer_query: getQueryObjectEXT() method - Web APIs

Limited availability

The EXT_disjoint_timer_query.getQueryObjectEXT() method of the WebGL API returns the state of a query object.

getQueryObjectEXT(query, pname)

query

A WebGLQuery object from which to return information.

pname

A GLenum specifying which information to return. Must be ext.QUERY_RESULT_EXT or ext.QUERY_RESULT_AVAILABLE_EXT.

Depends on pname:

• If pname is ext.QUERY_RESULT_EXT: A GLuint64EXT containing the query result.
• If pname is ext.QUERY_RESULT_AVAILABLE_EXT: A GLboolean indicating whether or not a query result is available.

const ext = gl.getExtension("EXT_disjoint_timer_query");
const query = ext.createQueryEXT();
ext.beginQueryEXT(ext.TIME_ELAPSED_EXT, query);

// Draw
ext.endQueryEXT(ext.TIME_ELAPSED_EXT);

// At some point in the future, after returning control to the browser
const available = ext.getQueryObjectEXT(query, ext.QUERY_RESULT_AVAILABLE_EXT);
const disjoint = gl.getParameter(ext.GPU_DISJOINT_EXT);

if (available && !disjoint) {
  // See how much time the rendering of the object took in nanoseconds.
  const timeElapsed = ext.getQueryObjectEXT(query, ext.QUERY_RESULT_EXT);
}

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