[suppress-warnings] --myst-suppress-warnings="myst.header"
.
# A
### B
.
<document ids="a" names="a" source="<string>" title="A">
    <title>
        A
    <subtitle ids="b" names="b">
        B
.

[title-to-header] --myst-title-to-header="yes"
.
---
title: "The title *nested syntax*"
---

# Other header
.
<document source="<string>">
    <docinfo>
        <field classes="title">
            <field_name>
                title
            <field_body>
                <paragraph>
                    <literal>
                        The title *nested syntax*
    <section ids="the-title-nested-syntax" names="the\ title\ nested\ syntax">
        <title>
            The title
            <emphasis>
                nested syntax
    <section ids="other-header" names="other\ header">
        <title>
            Other header
.

[linkify] --myst-enable-extensions=linkify
.
www.example.com
.
<document source="<string>">
    <paragraph>
        <reference refuri="http://www.example.com">
            www.example.com
.

[gfm-strikethrough] --myst-gfm-only="yes"
.
~~strike~~
.
<document source="<string>">
    <paragraph>
        <system_message level="2" line="1" source="<string>" type="WARNING">
            <paragraph>
                Strikethrough is currently only supported in HTML output [myst.strikethrough]
        <raw format="html" xml:space="preserve">
            <s>
        strike
        <raw format="html" xml:space="preserve">
            </s>

<string>:1: (WARNING/2) Strikethrough is currently only supported in HTML output [myst.strikethrough]
.

[gfm-disallowed-html] --myst-gfm-only="yes"
.
<strong> <title> <style> <em>

<blockquote>
  <xmp> is disallowed.  <XMP> is also disallowed.
</blockquote>
.
<document source="<string>">
    <paragraph>
        <raw format="html" xml:space="preserve">
            <strong>

        <raw format="html" xml:space="preserve">
            &lt;title>

        <raw format="html" xml:space="preserve">
            &lt;style>

        <raw format="html" xml:space="preserve">
            <em>
    <raw format="html" xml:space="preserve">
        <blockquote>
          &lt;xmp> is disallowed.  &lt;XMP> is also disallowed.
        </blockquote>
.

[gfm-autolink] --myst-gfm-only="yes"
.
www.commonmark.org

Visit www.commonmark.org/help for more information.

www.google.com/search?q=Markup+(business)

www.google.com/search?q=Markup+(business)))

(www.google.com/search?q=Markup+(business))

(www.google.com/search?q=Markup+(business)

www.google.com/search?q=(business))+ok

www.google.com/search?q=commonmark&hl=en

www.google.com/search?q=commonmark&hl;

www.commonmark.org/he<lp
.
<document source="<string>">
    <paragraph>
        <reference refuri="http://www.commonmark.org">
            www.commonmark.org
    <paragraph>
        Visit
        <reference refuri="http://www.commonmark.org/help">
            www.commonmark.org/help
         for more information.
    <paragraph>
        <reference refuri="http://www.google.com/search?q=Markup+(business)">
            www.google.com/search?q=Markup+(business)
    <paragraph>
        <reference refuri="http://www.google.com/search?q=Markup+(business)">
            www.google.com/search?q=Markup+(business)
        ))
    <paragraph>
        (
        <reference refuri="http://www.google.com/search?q=Markup+(business)">
            www.google.com/search?q=Markup+(business)
        )
    <paragraph>
        (
        <reference refuri="http://www.google.com/search?q=Markup+(business)">
            www.google.com/search?q=Markup+(business)
    <paragraph>
        <reference refuri="http://www.google.com/search?q=(business)">
            www.google.com/search?q=(business)
        )+ok
    <paragraph>
        <reference refuri="http://www.google.com/search?q=commonmark&amp;hl=en">
            www.google.com/search?q=commonmark&hl=en
    <paragraph>
        <reference refuri="http://www.google.com/search?q=commonmark&amp;hl">
            www.google.com/search?q=commonmark&hl
        ;
    <paragraph>
        <reference refuri="http://www.commonmark.org/he">
            www.commonmark.org/he
        <lp
.

[tasklist] --myst-enable-extensions=tasklist --myst-enable-checkboxes="true"
.
- [ ] a
- [x] b
.
<document source="<string>">
    <bullet_list bullet="-" classes="contains-task-list">
        <list_item classes="task-list-item enabled">
            <paragraph>
                <raw format="html" xml:space="preserve">
                    <input class="task-list-item-checkbox"  type="checkbox">
                 a
        <list_item classes="task-list-item enabled">
            <paragraph>
                <raw format="html" xml:space="preserve">
                    <input class="task-list-item-checkbox" checked="checked"  type="checkbox">
                 b
.

[url_schemes] --myst-url-schemes="{'ab': null, 'cd': '{{path}}', 'ef': {'url': 'https://{{path}}#{{fragment}}', 'title': 'My {{query}}', 'classes': ['xyz']}}"
.
<ab:xyz> <cd:xyz> <ef:xyz?text#other>
.
<document source="<string>">
    <paragraph>
        <reference refuri="ab:xyz">
            ab:xyz

        <reference refuri="xyz">
            cd:xyz

        <reference classes="xyz" refuri="https://xyz#other">
            My text
.

[url_schemes_list] --myst-url-schemes=ab
.
[](ab:c) [](http:c)
.
<document source="<string>">
    <paragraph>
        <reference refuri="ab:c">

        <problematic ids="problematic-1" refid="system-message-1">
    <section classes="system-messages">
        <title>
            Docutils System Messages
        <system_message backrefs="problematic-1" ids="system-message-1" level="3" line="1" source="<string>" type="ERROR">
            <paragraph>
                Unknown target name: "http:c".

<string>:1: (ERROR/3) Unknown target name: "http:c".
.

[heading_anchors] --myst-heading-anchors=1
.
# My title
[](#my-title)
.
<document ids="my-title" names="my\ title" slug="my-title" source="<string>" title="My title">
    <title>
        My title
    <paragraph>
        <reference id_link="True" refid="my-title">
            <inline classes="std std-ref">
                My title
.

[html_meta] --myst-html-meta='{"keywords": "Sphinx, MyST"}'
.
text
.
<document source="<string>">
    <meta content="Sphinx, MyST" name="keywords">
    <paragraph>
        text
.

[substitutions] --myst-enable-extensions=substitution --myst-substitutions='{"a": "b", "c": "d", "e": "{{f}}", "f": "{{e}}"}'
.
{{a}} {{c}} {{x}} {{e}}
.
<document source="<string>">
    <paragraph>
        b

        d

        <system_message level="2" line="1" source="<string>" type="WARNING">
            <paragraph>
                Substitution error:UndefinedError: 'x' is undefined [myst.substitution]

        <system_message level="2" line="3" source="<string>" type="WARNING">
            <paragraph>
                circular substitution reference: {'e'} [myst.substitution]

<string>:1: (WARNING/2) Substitution error:UndefinedError: 'x' is undefined [myst.substitution]
<string>:3: (WARNING/2) circular substitution reference: {'e'} [myst.substitution]
.

[attrs_image] --myst-enable-extensions=attrs_image
.
a
.
<document source="<string>">
    <paragraph>
        a
    <section classes="system-messages">
        <title>
            Docutils System Messages
        <system_message level="2" source="<string>" type="WARNING">
            <paragraph>
                The `attrs_image` extension is deprecated, please use `attrs_inline` instead. [myst.deprecated]

<string>:: (WARNING/2) The `attrs_image` extension is deprecated, please use `attrs_inline` instead. [myst.deprecated]
.

[attrs_inline_span] --myst-enable-extensions=attrs_inline
.
[content]{#id .a .b}
.
<document source="<string>">
    <paragraph>
        <inline classes="a b" ids="id" names="id">
            content
.

[attrs_inline_code] --myst-enable-extensions=attrs_inline
.
`content`{#id .a .b language=python}
.
<document source="<string>">
    <paragraph>
        <literal classes="a b code" ids="id" language="python" names="id">
            content
.

[attrs_inline_links] --myst-enable-extensions=attrs_inline
.
<https://example.com>{.a .b}

[hi](abc){.external}

(other)=
[text1](https://example.com){#id1 .a .b}

[text2](other){#id2 .c .d}

[ref]{#id3 .e .f}

[ref]: https://example.com

[text3](https://example.com){target="g"}

[text4](https://example.com){rel="h"}
.
<document source="<string>">
    <paragraph>
        <reference classes="a b" refuri="https://example.com">
            https://example.com
    <paragraph>
        <reference classes="external" refuri="abc">
            hi
    <target refid="other">
    <paragraph ids="other" names="other">
        <reference classes="a b" ids="id1" names="id1" refuri="https://example.com">
            text1
    <paragraph>
        <reference classes="c d" ids="id2" names="id2" refid="other">
            text2
    <paragraph>
        <reference classes="e f" ids="id3" names="id3" refuri="https://example.com">
            ref
    <paragraph>
        <reference refuri="https://example.com" target="g">
            text3
    <paragraph>
        <reference refuri="https://example.com" rel="h">
            text4
.

[attrs_inline_image] --myst-enable-extensions=attrs_inline
.
![a](b){#id .a width="100%" align=center height=20px}{.b}
.
<document source="<string>">
    <paragraph>
        <image align="center" alt="a" classes="a b" height="20px" ids="id" names="id" uri="b" width="100%">
.

[attrs_inline_image_warnings] --myst-enable-extensions=attrs_inline
.
![a](b){width=1x height=2x align=other }
.
<document source="<string>">
    <paragraph>
        <image alt="a" uri="b">
            <system_message level="2" line="1" source="<string>" type="WARNING">
                <paragraph>
                    Invalid 'width' attribute value: '1x' [myst.attribute]
            <system_message level="2" line="1" source="<string>" type="WARNING">
                <paragraph>
                    Invalid 'height' attribute value: '2x' [myst.attribute]
            <system_message level="2" line="1" source="<string>" type="WARNING">
                <paragraph>
                    Invalid 'align' attribute value: 'other' [myst.attribute]

<string>:1: (WARNING/2) Invalid 'width' attribute value: '1x' [myst.attribute]
<string>:1: (WARNING/2) Invalid 'height' attribute value: '2x' [myst.attribute]
<string>:1: (WARNING/2) Invalid 'align' attribute value: 'other' [myst.attribute]
.

[attrs_block] --myst-enable-extensions=attrs_block
.
{#myid1 .class1 .class2}
{#myid2 .class3}
My paragraph

{attribution="Chris Sewell"}
> Hallo
.
<document source="<string>">
    <paragraph classes="class1 class2 class3" ids="myid2" names="myid2">
        My paragraph
    <block_quote>
        <paragraph>
            Hallo
        <attribution>
            Chris Sewell
.

[inv_link]
.
<inv:#index>
[](inv:#index)
[*explicit*](inv:#index)
<inv:key#index>
[](inv:key#index)
<inv:key:std:label#search>
[](inv:key:std:label#search)
<inv:#in*>
[](inv:#in*)
<inv:key:*:doc#index>
[](inv:key:*:doc#index)
.
<document source="<string>">
    <paragraph>
        <reference internal="False" inv_match="key:std:doc:index" reftitle="Python" refuri="https://example.com/index.html">
            Title

        <reference internal="False" inv_match="key:std:doc:index" reftitle="Python" refuri="https://example.com/index.html">
            Title

        <reference internal="False" inv_match="key:std:doc:index" reftitle="Python" refuri="https://example.com/index.html">
            <emphasis>
                explicit

        <reference internal="False" inv_match="key:std:doc:index" reftitle="Python" refuri="https://example.com/index.html">
            Title

        <reference internal="False" inv_match="key:std:doc:index" reftitle="Python" refuri="https://example.com/index.html">
            Title

        <reference internal="False" inv_match="key:std:label:search" reftitle="Python" refuri="https://example.com/search.html">
            Search Page

        <reference internal="False" inv_match="key:std:label:search" reftitle="Python" refuri="https://example.com/search.html">
            Search Page

        <reference internal="False" inv_match="key:std:doc:index" reftitle="Python" refuri="https://example.com/index.html">
            Title

        <reference internal="False" inv_match="key:std:doc:index" reftitle="Python" refuri="https://example.com/index.html">
            Title

        <reference internal="False" inv_match="key:std:doc:index" reftitle="Python" refuri="https://example.com/index.html">
            Title

        <reference internal="False" inv_match="key:std:doc:index" reftitle="Python" refuri="https://example.com/index.html">
            Title
.

[inv_link_error]
.
<inv:#other>

<inv:*:*:*#*index>
.
<document source="<string>">
    <paragraph>
        <system_message level="2" line="1" source="<string>" type="WARNING">
            <paragraph>
                No matches for '*:*:*:other' [myst.iref_missing]
    <paragraph>
        <system_message level="2" line="3" source="<string>" type="WARNING">
            <paragraph>
                Multiple matches for '*:*:*:*index': key:std:label:genindex, key:std:label:modindex, key:std:label:py-modindex, ... [myst.iref_ambiguous]
        <reference internal="False" inv_match="key:std:label:genindex" reftitle="Python" refuri="https://example.com/genindex.html">
            Index

<string>:1: (WARNING/2) No matches for '*:*:*:other' [myst.iref_missing]
<string>:3: (WARNING/2) Multiple matches for '*:*:*:*index': key:std:label:genindex, key:std:label:modindex, key:std:label:py-modindex, ... [myst.iref_ambiguous]
.

[heading_slug_func] --myst-heading-anchors=2 --myst-heading-slug-func=myst_parser.config.main._test_slug_func
.
# title

## title

## title a b c

## title *nested syntax*

### other

[reversed](#eltit)
.
<document dupnames="title" ids="title" slug="eltit" source="<string>" title="title">
    <title>
        title
    <section dupnames="title" ids="title-1" slug="eltit-1">
        <title>
            title
    <section ids="title-a-b-c" names="title\ a\ b\ c" slug="c b a eltit">
        <title>
            title a b c
    <section ids="title-nested-syntax" names="title\ nested\ syntax" slug="xatnys detsen eltit">
        <title>
            title
            <emphasis>
                nested syntax
        <section ids="other" names="other">
            <title>
                other
            <paragraph>
                <reference id_link="True" refid="title">
                    reversed
.

[fence_as_directive] --myst-fence-as-directive=unknown,admonition --myst-enable-extensions=attrs_block
.
```unknown
```

{#myname .class1}
{a=b}
```admonition title
content
```
.
<document source="<string>">
    <system_message level="2" line="1" source="<string>" type="WARNING">
        <paragraph>
            Unknown directive type: 'unknown' [myst.directive_unknown]
    <system_message level="2" line="6" source="<string>" type="WARNING">
        <paragraph>
            'admonition': Unknown option keys: ['a'] (allowed: ['class', 'name']) [myst.directive_option]
    <admonition classes="class1" ids="myname" names="myname">
        <title>
            title
        <paragraph>
            content

<string>:1: (WARNING/2) Unknown directive type: 'unknown' [myst.directive_unknown]
<string>:6: (WARNING/2) 'admonition': Unknown option keys: ['a'] (allowed: ['class', 'name']) [myst.directive_option]
.

[links-external-new-tab] --myst-links-external-new-tab="true"
.
[text](https://example.com)
.
<document source="<string>">
    <paragraph>
        <reference refuri="https://example.com" rel="noreferer noopener" target="_blank">
            text
.
