CSSRenderer: Ensure element exists when execute remove.

[xiaoliyooo]

Related issue: #29660

I found that fixing this issue caused an edge issue where deleting a 2D object when its children contain non-2D objects would cause an error because its children did not have an element attribute, I think this should be added, although I'm not sure if this is the correct hierarchy.

[Mugen87]

Can you also update CSS3Renderer in the same way?

three.js/examples/jsm/renderers/CSS3DRenderer.js

Lines 54 to 71 in b641d6d

	this.addEventListener( 'removed', function () {
	this.traverse( function ( object ) {
	if (
	object.element instanceof object.element.ownerDocument.defaultView.Element &&
	object.element.parentNode !== null
	) {
	object.element.remove();
	}
	} );
	} );
	}

This change makes indeed the renderer more robust.

[xiaoliyooo]

Can you also update CSS3Renderer in the same way?你也可以用同样的方式更新 CSS3Renderer 吗？

three.js/examples/jsm/renderers/CSS3DRenderer.js

Lines 54 to 71 in b641d6d

	this.addEventListener( 'removed', function () {
	this.traverse( function ( object ) {
	if (
	object.element instanceof object.element.ownerDocument.defaultView.Element &&
	object.element.parentNode !== null
	) {
	object.element.remove();
	}
	} );
	} );
	}

This change makes indeed the renderer more robust.这一变化确实使渲染器更加健壮。

Okay, I'll add it on later!

[xiaoliyooo]

Can you also update CSS3Renderer in the same way?

three.js/examples/jsm/renderers/CSS3DRenderer.js

Lines 54 to 71 in b641d6d

	this.addEventListener( 'removed', function () {
	this.traverse( function ( object ) {
	if (
	object.element instanceof object.element.ownerDocument.defaultView.Element &&
	object.element.parentNode !== null
	) {
	object.element.remove();
	}
	} );
	} );
	}

This change makes indeed the renderer more robust.

Added😀!