dmitriid: Five seconds or more. It takes five seconds or more for Youtube to show video duration. Video duration is information that they have instant access to when they display other information like title.
An easy-to-use LaTeX editor/renderer.
Sea angel (© Alexander Semenov Images/Shutterstock)
This document recommends ways to reduce the forged-origin hijack attack surface by prudently limiting the set of IP prefixes that are