Yet another great example of why browser diversity matters and why Chrome’s overwhelming presence in both mobile and desktop use is harmful to the open web: some developers mistake Chrome’s adoption of an API as a web standard, when both Mozilla and Apple have serious concerns about the security of said API:
The API in question is currently hosted by the Web Incubator Community Group (WICG), a place where browser vendors can propose, discuss, and develop new web platform features, and receive feedback from the wider community.
Google has been developing the File System Access API for at least the past two years and decided to ship it in Chrome in October (last month). As part of this process, Google asked both Apple and Mozilla for their official positions on the API. So far, their responses have not been positive (Apple, Mozilla).
It seems that Google decided to ship the File System Access API in Chrome without endorsement from Apple or Mozilla because it believes that this feature “moves the web platform forward”:
Interoperability risk is the risk that browsers will not eventually converge on an interoperable implementation of the proposed feature. … If a change has high interop/compat risk but is expected to significantly move the web forward, Chromium will sometimes welcome it.
Standardization and support from Apple or Mozilla is not a requirement for shipping a web platform feature in Chrome. However, because of Chrome’s large market share, there is a risk of such a feature becoming a de facto standard:
Changes to Chrome’s functionality create de facto standards. Market participants must adhere to these standards or risk their technology no longer being compatible with most websites.