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20cbc2c785
Add a configuration option "noreferrerLinks". When set to "true" the "HTML_NOREFERRER_LINKS" flag is being passed to Blackfriday. Thereby all *absolute* links will get a "noreferrer" value for their "rel" attribute. See #4722
192 lines
8.3 KiB
Markdown
192 lines
8.3 KiB
Markdown
## Blackfriday Options
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`taskLists`
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: default: **`true`**<br>
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Blackfriday flag: <br>
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Purpose: `false` turns off GitHub-style automatic task/TODO list generation.
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`smartypants`
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: default: **`true`** <br>
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Blackfriday flag: **`HTML_USE_SMARTYPANTS`** <br>
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Purpose: `false` disables smart punctuation substitutions, including smart quotes, smart dashes, smart fractions, etc. If `true`, it may be fine-tuned with the `angledQuotes`, `fractions`, `smartDashes`, and `latexDashes` flags (see below).
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`smartypantsQuotesNBSP`
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: default: **`false`** <br>
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Blackfriday flag: **`HTML_SMARTYPANTS_QUOTES_NBSP`** <br>
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Purpose: `true` enables French style Guillemets with non-breaking space inside the quotes.
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`angledQuotes`
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: default: **`false`**<br>
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Blackfriday flag: **`HTML_SMARTYPANTS_ANGLED_QUOTES`**<br>
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Purpose: `true` enables smart, angled double quotes. Example: "Hugo" renders to «Hugo» instead of “Hugo”.
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`fractions`
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: default: **`true`**<br>
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Blackfriday flag: **`HTML_SMARTYPANTS_FRACTIONS`** <br>
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Purpose: <code>false</code> disables smart fractions.<br>
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Example: `5/12` renders to <sup>5</sup>⁄<sub>12</sub>(<code><sup>5</sup>&frasl;<sub>12</sub></code>).<br> <strong>Caveat:</strong> Even with <code>fractions = false</code>, Blackfriday still converts `1/2`, `1/4`, and `3/4` respectively to ½ (<code>&frac12;</code>), ¼ (<code>&frac14;</code>) and ¾ (<code>&frac34;</code>), but only these three.</small>
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`smartDashes`
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: default: **`true`** <br>
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Blackfriday flag: **`HTML_SMARTY_DASHES`** <br>
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Purpose: `false` disables smart dashes; i.e., the conversion of multiple hyphens into an en-dash or em-dash. If `true`, its behavior can be modified with the `latexDashes` flag below.
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`latexDashes`
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: default: **`true`** <br>
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Blackfriday flag: **`HTML_SMARTYPANTS_LATEX_DASHES`** <br>
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Purpose: `false` disables LaTeX-style smart dashes and selects conventional smart dashes. Assuming `smartDashes`: <br>
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If `true`, `--` is translated into – (`–`), whereas `---` is translated into — (`—`). <br>
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However, *spaced* single hyphen between two words is translated into an en dash— e.g., "`12 June - 3 July`" becomes `12 June – 3 July` upon rendering.
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`hrefTargetBlank`
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: default: **`false`** <br>
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Blackfriday flag: **`HTML_HREF_TARGET_BLANK`** <br>
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Purpose: `true` opens <s>external links</s> **absolute** links in a new window or tab. While the `target="_blank"` attribute is typically used for external links, Blackfriday does that for _all_ absolute links ([ref](https://discourse.gohugo.io/t/internal-links-in-same-tab-external-links-in-new-tab/11048/8)). One needs to make note of this if they use absolute links throughout, for internal links too (for example, by setting `canonifyURLs` to `true` or via `absURL`).
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`nofollowLinks`
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: default: **`false`** <br>
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Blackfriday flag: **`HTML_NOFOLLOW_LINKS`** <br>
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Purpose: `true` creates <s>external links</s> **absolute** links with `nofollow` being added to their `rel` attribute. Thereby crawlers are advised to not follow the link. While the `rel="nofollow"` attribute is typically used for external links, Blackfriday does that for _all_ absolute links. One needs to make note of this if they use absolute links throughout, for internal links too (for example, by setting `canonifyURLs` to `true` or via `absURL`).
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`noreferrerLinks`
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: default: **`false`** <br>
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Blackfriday flag: **`HTML_NOREFERRER_LINKS`** <br>
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Purpose: `true` creates <s>external links</s> **absolute** links with `noreferrer` being added to their `rel` attribute. Thus when following the link no referrer information will be leaked. While the `rel="noreferrer"` attribute is typically used for external links, Blackfriday does that for _all_ absolute links. One needs to make note of this if they use absolute links throughout, for internal links too (for example, by setting `canonifyURLs` to `true` or via `absURL`).
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`plainIDAnchors`
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: default **`true`** <br>
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Blackfriday flag: **`FootnoteAnchorPrefix` and `HeaderIDSuffix`** <br>
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Purpose: `true` renders any heading and footnote IDs without the document ID. <br>
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Example: renders `#my-heading` instead of `#my-heading:bec3ed8ba720b970`
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`extensions`
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: default: **`[]`** <br>
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Purpose: Enable one or more Blackfriday's Markdown extensions (**`EXTENSION_*`**). <br>
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Example: Include `hardLineBreak` in the list to enable Blackfriday's `EXTENSION_HARD_LINE_BREAK`. <br>
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*See [Blackfriday extensions](#blackfriday-extensions) section for information on all extensions.*
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`extensionsmask`
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: default: **`[]`** <br>
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Purpose: Disable one or more of Blackfriday's Markdown extensions (**`EXTENSION_*`**). <br>
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Example: Include `autoHeaderIds` as `false` in the list to disable Blackfriday's `EXTENSION_AUTO_HEADER_IDS`. <br>
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*See [Blackfriday extensions](#blackfriday-extensions) section for information on all extensions.*
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## Blackfriday extensions
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`noIntraEmphasis`
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: default: *enabled* <br>
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Purpose: The "\_" character is commonly used inside words when discussing
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code, so having Markdown interpret it as an emphasis command is usually the
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wrong thing. When enabled, Blackfriday lets you treat all emphasis markers
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as normal characters when they occur inside a word.
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`tables`
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: default: *enabled* <br>
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Purpose: When enabled, tables can be created by drawing them in the input
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using the below syntax:
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Example:
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Name | Age
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--------|------
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Bob | 27
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Alice | 23
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`fencedCode`
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: default: *enabled* <br>
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Purpose: When enabled, in addition to the normal 4-space indentation to mark
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code blocks, you can explicitly mark them and supply a language (to make
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syntax highlighting simple).
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You can use 3 or more backticks to mark the beginning of the block, and the
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same number to mark the end of the block.
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Example:
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```md
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# Heading Level 1
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Some test
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## Heading Level 2
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Some more test
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```
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`autolink`
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: default: *enabled* <br>
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Purpose: When enabled, URLs that have not been explicitly marked as links
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will be converted into links.
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`strikethrough`
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: default: *enabled* <br>
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Purpose: When enabled, text wrapped with two tildes will be crossed out. <br>
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Example: `~~crossed-out~~`
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`laxHtmlBlocks`
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: default: *disabled* <br>
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Purpose: When enabled, loosen up HTML block parsing rules.
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`spaceHeaders`
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: default: *enabled* <br>
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Purpose: When enabled, be strict about prefix header rules.
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`hardLineBreak`
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: default: *disabled* <br>
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Purpose: When enabled, newlines in the input translate into line breaks in
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the output.
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`tabSizeEight`
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: default: *disabled* <br>
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Purpose: When enabled, expand tabs to eight spaces instead of four.
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`footnotes`
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: default: *enabled* <br>
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Purpose: When enabled, Pandoc-style footnotes will be supported. The
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footnote marker in the text that will become a superscript text; the
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footnote definition will be placed in a list of footnotes at the end of the
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document. <br>
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Example:
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This is a footnote.[^1]
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[^1]: the footnote text.
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`noEmptyLineBeforeBlock`
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: default: *disabled* <br>
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Purpose: When enabled, no need to insert an empty line to start a (code,
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quote, ordered list, unordered list) block.
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`headerIds`
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: default: *enabled* <br>
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Purpose: When enabled, allow specifying header IDs with `{#id}`.
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`titleblock`
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: default: *disabled* <br>
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Purpose: When enabled, support [Pandoc-style title blocks][1].
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`autoHeaderIds`
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: default: *enabled* <br>
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Purpose: When enabled, auto-create the header ID's from the headline text.
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`backslashLineBreak`
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: default: *enabled* <br>
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Purpose: When enabled, translate trailing backslashes into line breaks.
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`definitionLists`
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: default: *enabled* <br>
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Purpose: When enabled, a simple definition list is made of a single-line
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term followed by a colon and the definition for that term. <br>
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Example:
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Cat
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: Fluffy animal everyone likes
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Internet
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: Vector of transmission for pictures of cats
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Terms must be separated from the previous definition by a blank line.
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`joinLines`
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: default: *enabled* <br>
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Purpose: When enabled, delete newlines and join the lines.
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[1]: http://pandoc.org/MANUAL.html#extension-pandoc_title_block
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