RFR: 8266666: Implementation for snippets

[Jonathan Gibbons]

On Thu, 15 Jul 2021 14:13:16 GMT, Pavel Rappo <prappo at openjdk.org> wrote:

> This PR implements JEP 413 "Code Snippets in Java API Documentation", which hasn't been yet proposed to target JDK 18. The PR starts as a squashed merge of the https://github.com/openjdk/jdk-sandbox/tree/jdk.javadoc/snippets branch.

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/resources/stylesheet.css line 881:

> 879: .bold {
> 880:     font-weight: bold;
> 881: }

Both the name and definition seem very global.  Maybe it would be better to restrict the effect of these names to within `pre.snippet`. @hns to advise?

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PR: https://git.openjdk.java.net/jdk/pull/4795