• named arguments (e.g. |filter(param = value)) are not supported. See #410
• currently twig.js does not have the same auto-escaping that Twig does.

Docs: Twig 3.x tags
Example syntax: {% tagName %}

• apply: ???
• autoescape: ???
• block: Supported
• cache: ???
• deprecated: ???
• do: ???
• embed: Supported
• extends: Supported
• flush: N/A
• for: Supported
• from: Supported
• if: Supported
• import: Supported
• include: Supported
• macro: Supported
• sandbox: ???
• set: Supported
• use: Supported
• verbatim: Supported
• with: Supported

Docs: Twig 3.x filters
Example syntax: {{ variable|filterName }}

• abs: Supported
• batch: Supported
• capitalize: Supported
• column: ???
• convert_encoding: N/A
• country_name: ???
• currency_name: ???
• currency_symbol: ???
• data_uri: ???
• date: Supported
• date_modify: Supported
• default: Supported
• escape: Supported
• filter: Supported
• first: Supported
• format: Supported
• format_currency: ???
• format_date: ???
• format_datetime: ???
• format_number: ???
• format_time: ???
• html_to_markdown: ???
• inky_to_html: ???
• inline_css: ???
• join: Supported
• json_encode: Supported
• keys: Supported
• language_name: ???
• last: Supported
• length: Supported
• locale_name: ???
• lower: Supported
• map: ???
• markdown_to_html: ???
• merge: Supported
• nl2br: Supported
• number_format: Supported
• raw: ???
• replace: Supported
• reverse: Supported
• round: Supported
• slice: Supported
• sort: Supported
• spaceless: Supported
• split: Supported
• striptags: Supported
• timezone_name: ???
• title: Supported
• trim: Supported
• u: ???
• upper: Supported
• url_encode: Supported

Docs: Twig 3.x functions
Example syntax: {{ functionName(arguments) }}

• attribute: ???
• block: ???
• constant: ???
• cycle: ???
• date: ???
• dump: ???
• html_classes: ???
• include: Throws error: "include function does not exist and is not defined in the context" https://github.com/twigjs/twig.js/issues/392
• max: ???
• min: ???
• parent: ???
• random: ???
• range: ???
• source: ???
• country_timezones: ???
• template_from_string: ???

Docs: Twig 3.x tests
Example syntax: {{ expression is testName }}

• constant:
• defined: Supported
• divisibleby: Supported
• empty: Supported
• even: Supported
• iterable: Supported
• null / none: Supported
• odd: Supported
• sameas: Supported

Docs: Twig 3.x operators
Example syntax: {{ expression operator expression }}

• in: Supported
• is: Supported
• Math (+, -, /, %, *, **): Supported
• Logic (and, or, not, ()): Supported
• Bitwise (b-and, b-or, b-xor): Supported
• Comparisons (==, !=, <, >, >=, <=, ===): Supported
• Others (.., |, ~, ., [], ?:): Supported
• Null-coalescing (??): Supported