Rule - MD019

Property	Value
Aliases	md019, no-multiple-space-atx
Autofix Available	Yes
Enabled By Default	Yes

Summary

Multiple spaces are present after hash character on Atx Heading.

Reasoning

Simplicity

All the Markdown parsers that we researched treat one space character after the hash character (#) the same as multiple space characters after the hash character. As such, the extra space characters have no purpose as they do not affect the rendering of the Atx Heading element.

Examples

Failure Scenarios

This rule triggers when the start of an Atx Heading element has more than one space character between the last hash character (#) and the first non-space character.

```Markdown

Heading 1

```

Correct Scenarios

This rule does not trigger with exactly one space character occurring between the last hash character and the first non-space character.

```Markdown

Heading 1

```

This rule is specifically targeted to the space between the hash character and the first non-space character. Between one and three leading space characters do not trigger this rule:

Markdown # Heading 1

Fix Description

Any instances of 1+ space characters within a normal Atx Heading are replaced with a single space character.

Configuration

Prefixes
plugins.md019.
plugins.no-multiple-space-atx.

Value Name	Type	Default	Description
enabled	boolean	True	Whether the Rule Plugin is enabled.

Origination of Rule

This rule is largely inspired by the MarkdownLint rule MD019.

Differences From MarkdownLint Rule

The original rule did not take any leading spaces into consideration, declaring that any leading spaces were a violation of this rule. As Rule Md023 addresses the number of leading spaces preceding an Atx Heading element, this rule was developed to ignore any leading spaces. The rationale is that if leading spaces before Atx Heading elements are not desired, there should only be one rule's configuration that needs to be set to enforce that.