The closing </{{closeTag.name}}> tag here doesn't pair with anything, because there are no opening tags that need to be closed.

The closing </{{closeTag.name}}> tag here doesn't pair with the opening <{{openTag.name}}> tag here.

The closing </{{closeTag.name}}> tag here is for a void element (that is, an element that doesn't need to be closed).

The <{{name}}> tag here can't be self-closed, because <{{name}}> is not a void element; it must be closed with a separate </{{name}}> tag.

The <{{openTag.name}}> tag here never closes.

The < character here appears to be the beginning of a tag, but is not followed by a valid tag name.

If you just want a < to appear on your Web page, try using &lt; instead.

Or, see a list of HTML5 tags.

The <{{openTag.name}}> tag's {{attribute.name.value}} attribute has a value here that doesn't end with a closing double quote.

The Attribute value here should start with an opening double quote.

The closing </{{closeTag.name}}> tag here doesn't end with a >.

The opening <{{openTag.name}}> tag here doesn't end with a >.

The comment here doesn't end with a -->.

This CSS declaration never closes.

CSS property {{cssProperty.property}} does not exist. You may want to see a list of CSS properties.

This CSS rule is not legal CSS.

Missing either a new CSS selector or the </style> tag here.

Selector {{cssSelector.selector}} still needs finalising with {

{{cssProperty.property}} is not a valid CSS property.

Missing property for {{cssSelector.selector}}.

Property {{cssProperty.property}} still needs finalising with :

Missing value for {{cssProperty.property}}.

Value {{cssValue.value}} still needs finalising with ;

Missing block opener after {{cssSelector.selector}}.

Missing block closer or next property:value; pair following {{cssValue.value}}.

A parse error occurred outside expected cases: {{error.msg}}

The CSS comment here doesn't end with a */.

HTML code was detected in CSS context starting here