Line length Open
Supported heading levels are between `2` and `4` (inclusive). Level `1` is reserved for the post title.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
> This is a blockquote by some not-so-famous person. It's important to make sure it looks good, too. Let's also throw in a tiny bit of `code` for good measure.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Inconsistent indentation for list items at the same level Open
1. Sometimes we have sub-items- Read upRead up
- Exclude checks
MD005 - Inconsistent indentation for list items at the same level
Tags: bullet, ul, indentation
Aliases: list-indent
This rule is triggered when list items are parsed as being at the same level, but don't have the same indentation:
* Item 1
* Nested Item 1
* Nested Item 2
* A misaligned itemUsually this rule will be triggered because of a typo. Correct the indentation for the list to fix it:
* Item 1
* Nested Item 1
* Nested Item 2
* Nested Item 3Blank line inside blockquote Open
- Read upRead up
- Exclude checks
MD028 - Blank line inside blockquote
Tags: blockquote, whitespace
Aliases: no-blanks-blockquote
This rule is triggered when two blockquote blocks are separated by nothing except for a blank line:
> This is a blockquote
> which is immediately followed by
> this blockquote. Unfortunately
> In some parsers, these are treated as the same blockquote.To fix this, ensure that any blockquotes that are right next to each other have some text in between:
> This is a blockquote.
And Jimmy also said:
> This too is a blockquote.Alternatively, if they are supposed to be the same quote, then add the blockquote symbol at the beginning of the blank line:
> This is a blockquote.
>
> This is the same blockquote.Rationale: Some markdown parsers will treat two blockquotes separated by one or more blank lines as the same blockquote, while others will treat them as separate blockquotes.
Inline HTML Open
**Code** is a key element in a website called _30 seconds of code_. Sometimes, it's `inline`, other times it's not. You might also have a key like <kbd>Cmd</kbd> in the text.- Read upRead up
- Exclude checks
MD033 - Inline HTML
Tags: html
Aliases: no-inline-html
This rule is triggered whenever raw HTML is used in a markdown document:
Inline HTML header
To fix this, use 'pure' markdown instead of including raw HTML:
# Markdown headerRationale: Raw HTML is allowed in markdown, but this rule is included for those who want their documents to only include "pure" markdown, or for those who are rendering markdown documents in something other than HTML.
Line length Open
Other times, they might be plain text linking to an internal resource, such as [this link](/snippets/demo/s/test-snippet.md).- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Inconsistent indentation for list items at the same level Open
2. That are also ordered- Read upRead up
- Exclude checks
MD005 - Inconsistent indentation for list items at the same level
Tags: bullet, ul, indentation
Aliases: list-indent
This rule is triggered when list items are parsed as being at the same level, but don't have the same indentation:
* Item 1
* Nested Item 1
* Nested Item 2
* A misaligned itemUsually this rule will be triggered because of a typo. Correct the indentation for the list to fix it:
* Item 1
* Nested Item 1
* Nested Item 2
* Nested Item 3Line length Open
**Code** is a key element in a website called _30 seconds of code_. Sometimes, it's `inline`, other times it's not. You might also have a key like <kbd>Cmd</kbd> in the text.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
Tables are quite special and they may be used in a few places. Let's make sure they look great.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Blank line inside blockquote Open
- Read upRead up
- Exclude checks
MD028 - Blank line inside blockquote
Tags: blockquote, whitespace
Aliases: no-blanks-blockquote
This rule is triggered when two blockquote blocks are separated by nothing except for a blank line:
> This is a blockquote
> which is immediately followed by
> this blockquote. Unfortunately
> In some parsers, these are treated as the same blockquote.To fix this, ensure that any blockquotes that are right next to each other have some text in between:
> This is a blockquote.
And Jimmy also said:
> This too is a blockquote.Alternatively, if they are supposed to be the same quote, then add the blockquote symbol at the beginning of the blank line:
> This is a blockquote.
>
> This is the same blockquote.Rationale: Some markdown parsers will treat two blockquotes separated by one or more blank lines as the same blockquote, while others will treat them as separate blockquotes.
Ordered list item prefix Open
3. That has a few items- Read upRead up
- Exclude checks
MD029 - Ordered list item prefix
Tags: ol
Aliases: ol-prefix
Parameters: style ("one", "ordered"; default "one")
This rule is triggered on ordered lists that do not either start with '1.' or do not have a prefix that increases in numerical order (depending on the configured style, which defaults to 'one').
Example valid list if the style is configured as 'one':
1. Do this.
1. Do that.
1. Done.Example valid list if the style is configured as 'ordered':
1. Do this.
2. Do that.
3. Done.Line length Open
This is a **test** snippet. It is intended to provide a centralized place to _test_ all sorts of markdown content that one could produce in a post. It is not intended to be published. Always make sure the `dateModified` is in the far, far future.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
However unlikely, it doesn't hurt to test for [`inline code block links that might break to a new line`](https://developer.mozilla.org/en-US/docs/Web/CSS/box-decoration-break) to make sure they render nicely.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
This was a good opportunity to test what a code block would look like right after a heading. Hope it looks good!- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Blank line inside blockquote Open
- Read upRead up
- Exclude checks
MD028 - Blank line inside blockquote
Tags: blockquote, whitespace
Aliases: no-blanks-blockquote
This rule is triggered when two blockquote blocks are separated by nothing except for a blank line:
> This is a blockquote
> which is immediately followed by
> this blockquote. Unfortunately
> In some parsers, these are treated as the same blockquote.To fix this, ensure that any blockquotes that are right next to each other have some text in between:
> This is a blockquote.
And Jimmy also said:
> This too is a blockquote.Alternatively, if they are supposed to be the same quote, then add the blockquote symbol at the beginning of the blank line:
> This is a blockquote.
>
> This is the same blockquote.Rationale: Some markdown parsers will treat two blockquotes separated by one or more blank lines as the same blockquote, while others will treat them as separate blockquotes.
Ordered list item prefix Open
2. That are also ordered- Read upRead up
- Exclude checks
MD029 - Ordered list item prefix
Tags: ol
Aliases: ol-prefix
Parameters: style ("one", "ordered"; default "one")
This rule is triggered on ordered lists that do not either start with '1.' or do not have a prefix that increases in numerical order (depending on the configured style, which defaults to 'one').
Example valid list if the style is configured as 'one':
1. Do this.
1. Do that.
1. Done.Example valid list if the style is configured as 'ordered':
1. Do this.
2. Do that.
3. Done.Inline HTML Open
Some other elements appear less frequently. Namely there's <small>small text</small>, which is relatively uncommon, exponents that look like <sup>this</sup> and this weird <sub>sub thing</sub> that we don't really use anywhere.- Read upRead up
- Exclude checks
MD033 - Inline HTML
Tags: html
Aliases: no-inline-html
This rule is triggered whenever raw HTML is used in a markdown document:
Inline HTML header
To fix this, use 'pure' markdown instead of including raw HTML:
# Markdown headerRationale: Raw HTML is allowed in markdown, but this rule is included for those who want their documents to only include "pure" markdown, or for those who are rendering markdown documents in something other than HTML.
Line length Open
In order to better test headings, we need to make sure that we have a lot of text here. The spacing between headings and paragraphs is imperative to get right.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Line length Open
This is a code block without a language. It doesn't appear very often, yet it's important to make sure it looks good.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
First header should be a top level header Open
## Headings- Read upRead up
- Exclude checks
MD002 - First header should be a top level header
Tags: headers
Aliases: first-header-h1
Parameters: level (number; default 1)
This rule is triggered when the first header in the document isn't a h1 header:
## This isn't a H1 header
### Another headerThe first header in the document should be a h1 header:
# Start with a H1 header
## Then use a H2 for subsectionsLine length Open
Links come in all shapes and sizes. They are often in the form of an automatically generated reference, such as `Array.from()`.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Ordered list item prefix Open
4. And we can go back to the main list- Read upRead up
- Exclude checks
MD029 - Ordered list item prefix
Tags: ol
Aliases: ol-prefix
Parameters: style ("one", "ordered"; default "one")
This rule is triggered on ordered lists that do not either start with '1.' or do not have a prefix that increases in numerical order (depending on the configured style, which defaults to 'one').
Example valid list if the style is configured as 'one':
1. Do this.
1. Do that.
1. Done.Example valid list if the style is configured as 'ordered':
1. Do this.
2. Do that.
3. Done.Inline HTML Open
Some other elements appear less frequently. Namely there's <small>small text</small>, which is relatively uncommon, exponents that look like <sup>this</sup> and this weird <sub>sub thing</sub> that we don't really use anywhere.- Read upRead up
- Exclude checks
MD033 - Inline HTML
Tags: html
Aliases: no-inline-html
This rule is triggered whenever raw HTML is used in a markdown document:
Inline HTML header
To fix this, use 'pure' markdown instead of including raw HTML:
# Markdown headerRationale: Raw HTML is allowed in markdown, but this rule is included for those who want their documents to only include "pure" markdown, or for those who are rendering markdown documents in something other than HTML.
Line length Open
And some other times, you might get a mixed content link, such as a link for the [modulo operator(`%`)](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Remainder), which needs to be carefully styled to make sure it looks good.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Blank line inside blockquote Open
- Read upRead up
- Exclude checks
MD028 - Blank line inside blockquote
Tags: blockquote, whitespace
Aliases: no-blanks-blockquote
This rule is triggered when two blockquote blocks are separated by nothing except for a blank line:
> This is a blockquote
> which is immediately followed by
> this blockquote. Unfortunately
> In some parsers, these are treated as the same blockquote.To fix this, ensure that any blockquotes that are right next to each other have some text in between:
> This is a blockquote.
And Jimmy also said:
> This too is a blockquote.Alternatively, if they are supposed to be the same quote, then add the blockquote symbol at the beginning of the blank line:
> This is a blockquote.
>
> This is the same blockquote.Rationale: Some markdown parsers will treat two blockquotes separated by one or more blank lines as the same blockquote, while others will treat them as separate blockquotes.
Inline HTML Open
Some other elements appear less frequently. Namely there's <small>small text</small>, which is relatively uncommon, exponents that look like <sup>this</sup> and this weird <sub>sub thing</sub> that we don't really use anywhere.- Read upRead up
- Exclude checks
MD033 - Inline HTML
Tags: html
Aliases: no-inline-html
This rule is triggered whenever raw HTML is used in a markdown document:
Inline HTML header
To fix this, use 'pure' markdown instead of including raw HTML:
# Markdown headerRationale: Raw HTML is allowed in markdown, but this rule is included for those who want their documents to only include "pure" markdown, or for those who are rendering markdown documents in something other than HTML.
Bare URL used Open
https://codepen.io/chalarangelo/pen/mdodgeL- Read upRead up
- Exclude checks
MD034 - Bare URL used
Tags: links, url
Aliases: no-bare-urls
This rule is triggered whenever a URL is given that isn't surrounded by angle brackets:
For more information, see http://www.example.com/.To fix this, add angle brackets around the URL:
For more information, see <http:></http:>.Rationale: Without angle brackets, the URL isn't converted into a link in many markdown parsers.
Note: if you do want a bare URL without it being converted into a link, enclose it in a code block, otherwise in some markdown parsers it will be converted:
`http://www.example.com`Line length Open
Some other elements appear less frequently. Namely there's <small>small text</small>, which is relatively uncommon, exponents that look like <sup>this</sup> and this weird <sub>sub thing</sub> that we don't really use anywhere.- Read upRead up
- Exclude checks
MD013 - Line length
Tags: line_length
Aliases: line-length Parameters: linelength, codeblocks, tables (number; default 80, boolean; default true)
This rule is triggered when there are lines that are longer than the configured line length (default: 80 characters). To fix this, split the line up into multiple lines.
This rule has an exception where there is no whitespace beyond the configured line length. This allows you to still include items such as long URLs without being forced to break them in the middle.
You also have the option to exclude this rule for code blocks and tables. To
do this, set the code_blocks and/or tables parameters to false.
Code blocks are included in this rule by default since it is often a requirement for document readability, and tentatively compatible with code rules. Still, some languages do not lend themselves to short lines.
Blank line inside blockquote Open
- Read upRead up
- Exclude checks
MD028 - Blank line inside blockquote
Tags: blockquote, whitespace
Aliases: no-blanks-blockquote
This rule is triggered when two blockquote blocks are separated by nothing except for a blank line:
> This is a blockquote
> which is immediately followed by
> this blockquote. Unfortunately
> In some parsers, these are treated as the same blockquote.To fix this, ensure that any blockquotes that are right next to each other have some text in between:
> This is a blockquote.
And Jimmy also said:
> This too is a blockquote.Alternatively, if they are supposed to be the same quote, then add the blockquote symbol at the beginning of the blank line:
> This is a blockquote.
>
> This is the same blockquote.Rationale: Some markdown parsers will treat two blockquotes separated by one or more blank lines as the same blockquote, while others will treat them as separate blockquotes.
Blank line inside blockquote Open
- Read upRead up
- Exclude checks
MD028 - Blank line inside blockquote
Tags: blockquote, whitespace
Aliases: no-blanks-blockquote
This rule is triggered when two blockquote blocks are separated by nothing except for a blank line:
> This is a blockquote
> which is immediately followed by
> this blockquote. Unfortunately
> In some parsers, these are treated as the same blockquote.To fix this, ensure that any blockquotes that are right next to each other have some text in between:
> This is a blockquote.
And Jimmy also said:
> This too is a blockquote.Alternatively, if they are supposed to be the same quote, then add the blockquote symbol at the beginning of the blank line:
> This is a blockquote.
>
> This is the same blockquote.Rationale: Some markdown parsers will treat two blockquotes separated by one or more blank lines as the same blockquote, while others will treat them as separate blockquotes.
Ordered list item prefix Open
2. Part of an ordered list- Read upRead up
- Exclude checks
MD029 - Ordered list item prefix
Tags: ol
Aliases: ol-prefix
Parameters: style ("one", "ordered"; default "one")
This rule is triggered on ordered lists that do not either start with '1.' or do not have a prefix that increases in numerical order (depending on the configured style, which defaults to 'one').
Example valid list if the style is configured as 'one':
1. Do this.
1. Do that.
1. Done.Example valid list if the style is configured as 'ordered':
1. Do this.
2. Do that.
3. Done.