This document is compressed using gzip. If you are seeing this then you browser correctly supports gzip content-encoding.

See it compressed in deflate-raw.
See it compressed in deflate-http (AKA zlib format), the correct deflate format according to HTML spec.
See it compressed in gzip.

Source of this script

This web-page (without this footer and without http-header) takes:

• 639B when not compressed.
• 287B when compressed using gzip format.
• 275B using deflate-http format.
• 269B using deflate-raw format.

More about website-optimization.