in src/performance/fmp.ts [267:287]
private setTag(target: Element, callbackCount: number): void {
const tagName: string = target.tagName;
if (IGNORE_TAG_SET.indexOf(tagName) === -1) {
const $children: HTMLCollection = target.children;
if ($children && $children.length > 0) {
for (let i = $children.length - 1; i >= 0; i--) {
const $child: Element = $children[i];
const hasSetTag = $child.getAttribute('fmp_c') !== null;
// If it is not marked, whether the marking condition is met is detected
if (!hasSetTag) {
const { left, top, width, height } = $child.getBoundingClientRect();
if (WH < top || WW < left || width === 0 || height === 0) {
continue;
}
$child.setAttribute('fmp_c', `${callbackCount}`);
}
this.setTag($child, callbackCount);
}
}
}
}