MD018 - no-missing-space-atx

Description

This rule checks that ATX-style headings have a space between the hash characters (#) and the heading text. For example, # Heading is correct, but #Heading is not.

Rationale

Missing a space after the hash characters in an ATX-style heading can cause the heading to be improperly rendered. Some Markdown parsers require a space after the hash to recognize the line as a heading.

Examples

Invalid

#Heading 1

##Heading 2

###Heading 3

Valid

# Heading 1

## Heading 2

### Heading 3