In this week’s roundup, Lighthouse sheds light on third-party scripts, insecure resources will get blocked on secure sites, and many country connection speeds are still trying to catch up to others… literally.
Lighthouse, Chrome’s built-in auditing tool, now shows a warning when the impact of third-party code on page load performance is too high. The pre-existing “Third-party usage” diagnostic audit will now fail if the total main-thread blocking time caused by third-parties is larger than 250ms during page load.
Note: This feature was added in Lighthouse version 5.3.0, which is currently available in Chrome Canary.
(via Patrick Hulce)
Currently, browsers still allow web pages loaded over a secure connection (HTTPS) to load images, videos, and audio over an insecure connection. Such insecurely-loaded resources on securely-loaded pages are known as “passive mixed content,” and they represent a security and privacy risk.
An insecurely-loaded image can allow an attacker to communicate incorrect information to the user (e.g., a fabricated stock chart), mutate client-side state (e.g., set a cookie), or induce the user to take an unintended action (e.g., changing the label on a button).
Starting next February, Chrome will auto-upgrade all passive mixed content to
https:, and resources that fail to load over
https: will be blocked. According to data from Chrome Beta, auto-upgrade currently fails for about 30% of image loads.
(via Emily Stark)
Data from Chrome UX Report shows that there are still many countries and territories in the world where most people access the Internet over a 3G or slower connection. (This includes a number of small island nations that are not visible on this map.)
(via Paul Calvano)
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