CSS Regions
Method of flowing content into multiple elements, allowing magazine-like layouts. While once supported in WebKit-based browsers and Internet Explorer, implementing the feature is no longer being pursued by any browser.
Lookbehind in JS regular expressions
The positive lookbehind (`(?<= )`) and negative lookbehind (`(?<! )`) zero-width assertions in JavaScript regular expressions can be used to ensure a pattern is preceded by another pattern.
navigator api: registerprotocolhandler
navigator api: registerprotocolhandler: `scheme` parameter supports `cabal`
navigator api: registerprotocolhandler: `scheme` parameter supports `dat`
navigator api: registerprotocolhandler: `scheme` parameter supports `did`
navigator api: registerprotocolhandler: `scheme` parameter supports `dweb`
navigator api: registerprotocolhandler: `scheme` parameter supports `ftp`
navigator api: registerprotocolhandler: `scheme` parameter supports `ftps`
navigator api: registerprotocolhandler: `scheme` parameter supports `geo`
navigator api: registerprotocolhandler: `scheme` parameter supports `hyper`
navigator api: registerprotocolhandler: `scheme` parameter supports `im`
navigator api: registerprotocolhandler: `scheme` parameter supports `ipfs`
navigator api: registerprotocolhandler: `scheme` parameter supports `ipns`
navigator api: registerprotocolhandler: `scheme` parameter supports `irc`
navigator api: registerprotocolhandler: `scheme` parameter supports `ircs`
navigator api: registerprotocolhandler: `scheme` parameter supports `mms`
navigator api: registerprotocolhandler: `scheme` parameter supports `news`
navigator api: registerprotocolhandler: `scheme` parameter supports `nntp`
navigator api: registerprotocolhandler: `scheme` parameter supports `sftp`
navigator api: registerprotocolhandler: `scheme` parameter supports `sip`
navigator api: registerprotocolhandler: `scheme` parameter supports `sms`
navigator api: registerprotocolhandler: `scheme` parameter supports `ssb`
navigator api: registerprotocolhandler: `scheme` parameter supports `ssh`
navigator api: registerprotocolhandler: `scheme` parameter supports `tel`
navigator api: registerprotocolhandler: `scheme` parameter supports `urn`
navigator api: registerprotocolhandler: `scheme` parameter supports `wtai`
navigator api: registerprotocolhandler: `scheme` parameter supports `xmpp`
navigator api: registerprotocolhandler: secure context required
vttcue api: region
regular_expressions: backreference: `\1`, `\2`
regular_expressions: capturing group: `(...)`
regular_expressions: character class: `[...]`, `[^...]`
regular_expressions: character class escape: `\d`, `\d`, `\w`, `\w`, `\s`, `\s`
regular_expressions: character escape: `\n`, `\x`
regular_expressions: character escape: `\n`, `\x`: unicode character escape: `\u{...}`
regular_expressions: disjunction: `|`
regular_expressions: input boundary assertion: `^`, `$`
regular_expressions: literal character: `a`, `b`
regular_expressions: lookahead assertion: `(?=...)`, `(?!...)`
regular_expressions: lookbehind assertion: `(?<=...)`, `(?<!...)`
regular_expressions: named backreference: `\k<name>`
regular_expressions: named capture group: `(?<name>...)`
regular_expressions: named capture group: `(?<name>...)`: duplicate names in different disjunction alternatives are allowed
regular_expressions: non-capturing group: `(?:...)`
regular_expressions: quantifier: `*`, `+`, `?`, `{n}`, `{n,}`, `{n,m}`
regular_expressions: unicode character class escape: `\p{...}`, `\p{...}`
regular_expressions: wildcard: `.`
regular_expressions: word boundary assertion: `\b`, `\b`
lookahead assertions in js regular expressions
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