Method select

src/core/dom/srcset.js:155–165

* Performs selection for specified width and DPR. Here, width is the width * in screen pixels and DPR is the device-pixel-ratio or pixel density of * the device. Depending on the circumstances, such as low network conditions, * it's possible to manipulate the result of this method by passin

(width, dpr)

   * @return {string}
   */
  select(width, dpr) {
    devAssert(width, 'width=%s', width);
    devAssert(dpr, 'dpr=%s', dpr);
    let index = 0;
    if (this.widthBased_) {
      index = this.selectByWidth_(width * dpr);
    } else {
      index = this.selectByDpr_(dpr);
    }
    return this.sources_[index].url;
  }

  /**
   * @param {number} width