Check Accessibility, HTML, CSS, Broken Links & Spelling

E700

Missing end of comment

A CSS comment was found, but the end of the comment was missing.

E701

The closing quote is missing

An opening quote was found, but the matching end quote was missing. Outside of strings, quotes must always appear in matching pairs, and any single quotes must be escaped using '\'.

E702

Closing brace '}' is missing

The start of a block '{' was found, but the matching end brace '}' was missing.

E703

Mismatched pairs of '()', or '[]' found

Outside of strings, you must have matching pairs of parentheses '()' and square brackets '[]'. This error is normally displayed when there is a missing parenthesis or bracket, or an additional one has been entered by mistake, or an extra one has been deliberately added but hasn't been properly escaped using '\'.

E704

An incomplete at-rule has been detected

The start of an at-rule was found, but the rest of the rule appears to be missing.

E705

A block was expected but was not found

A block was expected, but the opening brace '{' at the start of the block could not be found.

E706

A selector was expected but could not be found

A selector appears to be missing. This may be caused by the complete absence of any selector, or in a complex selector one of the simple selectors is missing. This may be due to a simple error such as having an extra comma.

E707

The block appears to have ended prematurely

The closing brace '}' of a block appears before the end of the declaration.

E708

The property name is missing

A property name was expected but could not be found.

E709

Incomplete declaration

The declaration appears to be incomplete. Either no property name or no values were found.

E710

The semi-colon is missing from the end of the at-rule

at-rules should either have a block or a statement ending with a semi-colon, and neither could be found.

E7111

The identifier includes a character which is not allowed

There are restrictions on what characters are allowed here. See CSS Level 3 ident-token definition.

E7112

The the escape character '\' is not allowed at the end of an identifier

There are restrictions on what characters are allowed here. See CSS Level 3 ident-token definition.

E7113

Two dashes '--' are not allowed here

There are restrictions on what characters are allowed here. See CSS Level 3 ident-token definition.

E7114

A single dash '-' is not allowed at this place

There are restrictions on what characters are allowed here. See CSS Level 3 ident-token definition.

E7115

A dash followed by a number is not allowed here

There are restrictions on what characters are allowed here. See CSS Level 3 ident-token definition.

E7116

The selector cannot consist solely of, or end with, any of the characters: ':#.|'

These characters are special and can only be used in certain places in the selector. See Selectors Grammar.

E721

Unrecognised at-rule

The at-rule is not recognised as valid for the selected CSS Level.

E722

The @charset rule is not allowed here

The @charset rule can only be used in a separate CSS document and not in HTML documents.

E723

The @charset rule must be the first line in the document

The exact 10 characters @charset " must be the first thing in the document. Anything, even white space, prior to this will trigger this error. See @charset.

E724

Unrecognised character set

The character set specified is not recognised. This may be because it is misspelt.

E725

The @import rule does not precede all other rules

Any @import rules must precede all other rules, except the @charset rule. See @import.

E726

The at-rule is incorrectly formatted

The at-rule does not follow the standard definition. LINK TO STANDARD.

E727

Invalid URI

It is an invalid URI, most likely containing invalid characters such as spaces. See RFC 3986.

E7281

This item is not allowed here

An at-rule, property or other item was used, which is not allowed in this context. LINK TO STANDARD.

E7282

The at-rule AT_RULE is not allowed here

An at-rule was used, which is not allowed in this context. See the link to the standard for what is allowed. LINK TO STANDARD.

E7283

The property PROPERTY NAME is not allowed here

A property was used, which is not allowed in this context. LINK TO STANDARD.

E7291

Invalid page pseudo-class

The @page rule can only be used with specific pseudo-classes. LINK TO STANDARD.

E7292

Missing page selector

A page selector was expected but appears to be missing. This can be caused by an extra comma in the list of page selectors. LINK TO STANDARD.

E7293

Invalid identifier in page selector

The identifier used in the page selector includes a character which is not allowed. See CSS Level 3 ident-token definition. LINK TO STANDARD.

E730

Missing font family

With the @font-feature-values rule, one or more font family names should be provided.

E731

One or more of the listed font families is badly formatted

One or more of the font family names listed do not meet the requirements of the specification. LINK TO STANDARD.

E732

Missing feature value list

With font variant value definitions, a list of feature values must be provided.

E733

Invalid feature value list

The list of feature values does not meet the requirements of the specification.

E735

The @namespace rule does not precede all other rules

Any @namespace rules must precede all other rules, except the @charset and @import rules. See @namespace.

E736

The namespace NAMESPACE has not been not declared

A @namespace rule declaring the namespace used in the selector was not found.

E737

A counter-style system descriptor is required

The @counter-style at-rule must have a system descriptor. LINK TO STANDARD.

E738

The counter-style name has an invalid name

The @counter-style at-rule cannot have any of these names: disc, decimal, default, unset, inherit, initial, revert or none. LINK TO STANDARD.

E739

The @charset rule is badly-formed

@charset must be written literally; the 10 characters @charset " (lowercase, no backslash escapes), followed by the encoding name, and ending with "; See @charset.

E740

Missing or invalid palette name

With the @font-palette-values at-rule, a valid author-defined palette name must be provided. LINK TO STANDARD.

E741

A font-family descriptor is required

The @font-palette-values at-rule must have a font-family descriptor. LINK TO STANDARD.

E742

Missing or invalid position-try-option

With the @position-try at-rule, a valid position-try-option must be provided. LINK TO STANDARD.

E755

Pseudo-elements can only appear at the end of a selector

Pseudo-elements may only be appended after the last simple selector of the selector. See Pseudo-Elements.

E756

Unrecognised pseudo-element or pseudo-class

Each CSS standard allows different pseudo-elements and pseudo-classes to be used, and one used here does not match the list of allowed pseudo-elements/pseudo-classes for this CSS Level.

E757

A media type is missing

A media type was expected but appears to be missing. This can be caused by an extra comma in a list of media types.

E758

The media type MEDIA TYPE was not recognised

Each CSS Level allows different media types to be used, and the type used here does not match the list of allowed types for this CSS Level. LINK TO STANDARD.

E759

The media query contains a parsing error

The media query could not be parsed properly. This is typically caused by a colon ':', or range character '>', '<', '=' missing or in the wrong place.

E760

Unrecognised media feature: MEDIA FEATURE

The media feature name is not recognised for the selected CSS Level. LINK TO STANDARD.

E761

INVALID MEDIA FEATURE: OFFICIAL RULES

The value used is invalid for this media feature, because the value does not follow the allowed rules for this feature. A list of valid rules will be displayed for the feature.

E762

The to and from keywords must appear only once

The to and from keywords must appear only once in a keyframe selector. See @keyframes.

E763

Invalid percentage found in keyframe selector

Percentages must end with the '%' character and the value must be between 0% and 100%. See @keyframes.

E764

Invalid identifier found in keyframe selector

The identifier used in the keyframe selector includes a character which is not allowed. See CSS Level 3 ident-token definition. LINK TO STANDARD.

E776

Unrecognised property: PROPERTY NAME

The property name is not recognised for the selected CSS Level.

E777

INVALID VALUE: OFFICIAL RULES

Check the value against the list of valid rules from the official standard. LINK TO STANDARD.

E779

The !important keyword is not allowed here

The !important keyword is only allowed in property values and not in declaration values.

W776

A vendor extension has been used

Authors should avoid using vendor extensions where possible. See Vendor-specific extensions.

W777

This item is experimental and has been ignored: ITEM

Because this item is so new, it's definition has not yet been agreed upon, and so it has not been tested. Experimental items should be avoided as few browsers may support them, and their definition may change at any time.

W778

The media type MEDIA TYPE is deprecated

This media type has been deprecated and so should no longer be used. Authors must not use these media types; instead, it is recommended that they select appropriate media features that better represent the aspect of the device that they are attempting to style against. LINK TO STANDARD.

W779

The media feature MEDIA FEATURE is deprecate

This media feature has been deprecated and so should no longer be used. Authors must not use these media features; instead, it is recommended that they select alternative media features as detailed in the link to the specification. LINK TO STANDARD.