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The first alpha version of Bootstrap 4 was released on August 19, 2015. [16] The first beta version was released on August 10, 2017. [17] Otto suspended work on Bootstrap 3 on September 6, 2016, to free up time to work on Bootstrap 4. Bootstrap 4 was finalized on January 18, 2018. [18] Significant changes include: Major rewrite of the code
[5] Less is inspired by Sass. [6] [3] Sass was designed to both simplify and extend CSS, so things like curly braces were removed from the syntax. Less was designed to be as close to CSS as possible, and as a result existing CSS can be used as valid Less code. [7] The newer versions of Sass also introduced a CSS-like syntax called SCSS (Sassy CSS).
Header introduced by Netscape in 1995 and became a de facto standard supported by most web browsers. Eventually standardized in the HTML Living Standard in 2017. [64] Refresh: 5; url= Report-To [65] Instructs the user agent to store reporting endpoints for an origin.
SOCKS Protocol Version 5: March 1996: SOCKS5: RFC 1939 : Post Office Protocol - Version 3: May 1996: POP v 3: RFC 1945 : Hypertext Transfer Protocol—HTTP/1.0: May 1996: HTTP v 1.0: RFC 1948 : Defending Against Sequence Number Attacks: May 1996: IP spoofing: RFC 1950 : ZLIB Compressed Data Format Specification version 3.3: May 1996: Zlib v 3.3 ...
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Bootstrap Studio was launched on October 19, 2015 with a post on Product Hunt where it reached number 4 in the Product of the Day category. [5] Version 2.0 of the software was released on January 22, 2016 and brought JavaScript editing, multi-page support and improved the CSS support. [6] Version 4.0 was launched on November 1, 2017.
Unlike the other status codes above, these were not sent as the response status in the HTTP protocol, but as part of the "Warning" HTTP header. [56] [57] Since this "Warning" header is often neither sent by servers nor acknowledged by clients, this header and its codes were obsoleted by the HTTP Working Group in 2022 with RFC 9111. [58]
In C and C++, a header file is a source code file that allows programmers to separate elements of a codebase – often into reusable, logically-related groupings. A header file declares programming elements such as functions , classes , variables , and preprocessor macros .