W3C提供的XMLHttpRequest中Level 2和Level 1的meaning/difference是什么
What is meaning/difference of Level 2 and Level 1 in XMLHttpRequest provided by W3C
W3C提供的XMLHttpRequest文档中Level 2和Level 1的meaning/difference是什么
W3c 提供的文档中 Level No 代表什么？
在 W3C 制定规范时，可以同时存在多个不同成熟度的主要修订版。因此，例如，Level 1 可能是更成熟的版本（更接近于成为推荐标准），而 Level 2 可能定义了更多功能，但离成为 REC 更远。
在XHR的具体情况下（基于"Specification history" section of the spec）：
- XMLHttpRequest 对象最初定义为 WHATWG 的 HTML 规范的一部分。
W3C XMLHttpRequest Level 1 was an attempt to push the description of the functionality already implemented by MS Internet Explorer (and copied by other browsers) through the W3C Process，旨在：
- support multiple specification development methodologies
- maximize consensus about the content of stable technical reports
- ensure high technical and editorial quality
- promote consistency among specifications
- facilitate royalty-free, interoperable implementations of Web Standards, and
earn endorsement by W3C and the broader community.
由于成为 W3C 推荐的过程相当缓慢，大多数尚未实施的改进都在单独的文档中定义，W3C XMLHttpRequest Level 2，旨在成为晚于 Level 1 的 W3C 推荐标准，并最终取代 Level 1 版本。
- 在某些时候，维护者 found that the snapshot-based development approach didn't work very well, decided to abandon the attempt to publish the documents as W3C-endorsed recommendations and continued to develop a single specification, WHATWG XMLHttpRequest Living Standard.
W3C提供的XMLHttpRequest文档中Level 2和Level 1的meaning/difference是什么
W3c 提供的文档中 Level No 代表什么？
在 W3C 制定规范时，可以同时存在多个不同成熟度的主要修订版。因此，例如，Level 1 可能是更成熟的版本（更接近于成为推荐标准），而 Level 2 可能定义了更多功能，但离成为 REC 更远。
在XHR的具体情况下（基于"Specification history" section of the spec）：
- XMLHttpRequest 对象最初定义为 WHATWG 的 HTML 规范的一部分。
W3C XMLHttpRequest Level 1 was an attempt to push the description of the functionality already implemented by MS Internet Explorer (and copied by other browsers) through the W3C Process，旨在：
- support multiple specification development methodologies
- maximize consensus about the content of stable technical reports
- ensure high technical and editorial quality
- promote consistency among specifications
- facilitate royalty-free, interoperable implementations of Web Standards, and earn endorsement by W3C and the broader community.
由于成为 W3C 推荐的过程相当缓慢，大多数尚未实施的改进都在单独的文档中定义，W3C XMLHttpRequest Level 2，旨在成为晚于 Level 1 的 W3C 推荐标准，并最终取代 Level 1 版本。
- 在某些时候，维护者 found that the snapshot-based development approach didn't work very well, decided to abandon the attempt to publish the documents as W3C-endorsed recommendations and continued to develop a single specification, WHATWG XMLHttpRequest Living Standard.