Rules

Every message from the compiler has a code, and every code has a page: why it's checked, a page that breaks the rule, what the compiler says about it, and the fix.

Accessibility

• A11Y-001image has no alt text
• A11Y-002link has no text
• A11Y-003video has no captions
• A11Y-004action has no label
• A11Y-005button has no text
• A11Y-006heading level skipped
• A11Y-007link text doesn't say where it goes
• A11Y-008alt text doesn't describe the image
• A11Y-009iframe has no title
• A11Y-010positive tabindex
• A11Y-011autoplaying video isn't muted
• A11Y-012ARIA name or state on a div without a role
• A11Y-013same link text, different places
• A11Y-014clickable element that isn't a control
• A11Y-015form control has no label

Search engines

• SEO-001page has no title or description
• SEO-002title too long
• SEO-003more than one h1
• SEO-004page has no h1
• SEO-005canonical URL isn't absolute
• SEO-006description too short or too long

Security

• SEC-001inline event handler
• SEC-002raw HTML from data
• SEC-003URL that runs code
• SEC-004data in an attribute that runs code
• SEC-005data name in a script or style
• SEC-006formaction or base sending forms elsewhere
• SEC-007data in the values of an animated link

Forms

• FORM-001field has no name or type
• FORM-002field has no label
• FORM-003form has no button
• FORM-004form with fields has no name
• FORM-005field outside a form
• FORM-006unknown form method

Attributes

• ATTR-001unknown attribute
• ATTR-002raw has no HTML
• ATTR-003wrong kind of value
• ATTR-004unnamed argument where a name is needed
• ATTR-005attribute set twice
• ATTR-006text on an element that takes none
• ATTR-007default outside a component parameter
• ATTR-008invalid attribute name

Structure

• SEM-001unknown element
• SEM-002file has no page
• SEM-003element in the wrong place
• SEM-004image or video has no source
• SEM-005action has no name
• SEM-006slot outside a component or layout
• SEM-007imported file contains a page
• SEM-008void element has children
• SEM-009html, body or title written by hand
• SEM-010head in the wrong place
• SEM-011element doesn't belong in head
• SEM-012id used more than once
• SEM-013lang isn't a language code
• SEM-014invalid action name

Data

• TYPE-001prop missing from the data
• TYPE-002unknown name or field
• TYPE-003value isn't a list
• TYPE-004unknown field type
• TYPE-005wrong argument for a field type

Components

• COMP-001unknown component
• COMP-002missing component argument
• COMP-003unknown component argument
• COMP-004component defined twice
• COMP-005component name isn't capitalized
• COMP-006unnamed component argument
• COMP-007component calls itself
• COMP-008malformed component parameter
• COMP-009page expands to too many elements
• COMP-010content without a slot

Layouts

• LAYOUT-001unknown layout
• LAYOUT-002layout has no slot
• LAYOUT-003layout defined twice
• LAYOUT-004layout name isn't capitalized
• LAYOUT-005layout inside itself

Imports

• IMPORT-001imported file can't be read

allow

• ALLOW-001allow has no reason
• ALLOW-002allow has no rule code
• ALLOW-003allow names an unknown rule

Syntax

• LEX-001unexpected character
• LEX-002unterminated string
• LEX-003unknown escape in a string
• PARSE-001syntax error
• PARSE-002nested too deeply