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micromark-extension-gfm-tagfilter
Advanced tools
Readme
micromark extension to support GFM tag filter.
This package contains an extension that adds support for the tagfilter enabled
by GFM to micromark
.
The tagfilter is kinda weird and kinda useless.
This package exists for completeness.
The tag filter is a naïve attempt at XSS protection.
You should use a proper HTML sanitizing algorithm.
This project is useful when you want to match how GitHub works.
You can use this extension when you are working with micromark
already.
When you do, you can instead use
micromark-extension-gfm
, which includes this
extension, to support all GFM features.
When you want to deal with syntax trees, you should instead use
hast-util-sanitize
.
When you use remark and rehype, you should use
rehype-sanitize
.
This package is ESM only. In Node.js (version 16+), install with npm:
npm install micromark-extension-gfm-tagfilter
In Deno with esm.sh
:
import {gfmTagfilterHtml} from 'https://esm.sh/micromark-extension-gfm-tagfilter@2'
In browsers with esm.sh
:
<script type="module">
import {gfmTagfilterHtml} from 'https://esm.sh/micromark-extension-gfm-tagfilter@2?bundle'
</script>
import {micromark} from 'micromark'
import {gfmTagfilterHtml} from 'micromark-extension-gfm-tagfilter'
const output = micromark('XSS! <script>alert(1)</script>', {
allowDangerousHtml: true,
htmlExtensions: [gfmTagfilterHtml()]
})
console.log(output)
Yields:
<p>XSS! <script>alert(1)</script></p>
This package exports the identifier
gfmTagfilterHtml
.
There is no default export.
gfmTagfilterHtml()
Create an HTML extension for micromark
to support GitHubs weird and
useless tagfilter when serializing to HTML.
Extension for micromark
that can be passed in htmlExtensions
to support
GitHubs weird and useless tagfilter when serializing to HTML
(HtmlExtension
).
This package relates to malicious authors, not decent authors.
GFM tagfilter removes certain dangerous HTML tags: iframe
, noembed
,
noframes
, plaintext
, script
, style
, title
, textarea
, and xmp
.
This package does not relate to CSS.
This package does not change how markdown is parsed.
This package is fully typed with TypeScript. It exports no additional types.
Projects maintained by the unified collective are compatible with maintained versions of Node.js.
When we cut a new major release, we drop support for unmaintained versions of
Node.
This means we try to keep the current release line,
micromark-extension-gfm-tagfilter@^2
, compatible with Node.js 16.
This package works with micromark
version 3
and later.
While micromark is safe by default, this extension only does something when
allowDangerousHtml: true
is passed, which is an unsafe option.
This package is not safe.
micromark-extension-gfm
— support all of GFMhast-util-sanitize
— hast utility to make trees saferehype-sanitize
— rehype plugin to sanitize HTMLSee contributing.md
in micromark/.github
for ways to get
started.
See support.md
for ways to get help.
This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.
FAQs
micromark extension to support GFM tagfilter
The npm package micromark-extension-gfm-tagfilter receives a total of 2,959,823 weekly downloads. As such, micromark-extension-gfm-tagfilter popularity was classified as popular.
We found that micromark-extension-gfm-tagfilter demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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