Block structure was introduced into computer programming languages by the Algol project (1957–1960), which, as a consequence, also featured a context-free grammar to describe the resulting Algol syntax. This became a standard feature of computer languages, and the notation for grammars used in concrete descriptions of computer languages came to be known as Backus–Naur form , after two members of the Algol language design committee.  The "block structure" aspect that context-free grammars capture is so fundamental to grammar that the terms syntax and grammar are often identified with context-free grammar rules, especially in computer science. Formal constraints not captured by the grammar are then considered to be part of the "semantics" of the language.
Each of the Capital Punishment in Context case narratives highlights several broader issues that can be explored further. By clicking on one of the topic headings, you will be able to investigate these issues more fully. In addition to connecting the issue with the facts in the cases, these links also provide access to materials prepared by leading researchers and scholars.
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The canvas attribute must return the canvas element that the context paints on.