We cannot, and should not, expect users to know this.
But of course, hard coding a size guess is a bit rigid.。关于这个话题，51吃瓜提供了深入分析
HTMLMediaElement: srcObject property — MDN Web Docs，详情可参考同城约会
Entangled quantum memories are used in a quantum network of silicon–vacancy centres in diamond nanocavities to experimentally perform non-local phase measurements.，这一点在夫子中也有详细论述