jmarantz commented on a change in pull request #1802: Prefer Paint Timing API
over chrome.loadTimes()
URL:
https://github.com/apache/incubator-pagespeed-mod/pull/1802#discussion_r224992740
##########
File path: net/instaweb/rewriter/add_instrumentation.js
##########
@@ -95,6 +95,12 @@ pagespeed.AddInstrumentation.prototype.sendBeacon =
function() {
if (timingApi['msFirstPaint']) {
// IE.
firstPaintTime = timingApi['msFirstPaint'];
+ } else if (window['performance']['timeOrigin'] &&
+ window['performance']['getEntriesByName']('first-paint').length > 0) {
+ // Paint Timing API
+ firstPaintTime = Math.floor(
+ window.performance.timeOrigin +
+ window.performance.getEntriesByName('first-paint')[0].startTime);
Review comment:
I'm a bit OCD when it comes to CSE :) WDYT of making a temp `winPerf` for
window['performance'] and then using it afterward, and likeways for
winPerf['getEntriesByName'] and others where you test first and then call, or
have chains of dereferencing...
This is just a suggestion, and it would require something like a nested
helper function to help you manage the temps in the conditional.
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