Use this text operation when its stated character encoding, token boundaries, normalization, case handling, and output format match the surrounding workflow.

Attribute present

Required boolean.

Attribute value

Required string.

The cited overview of Cross-origin resource sharing supplies background for the terminology and domain context used by this tool.^[1]

Resolve an HTML crossorigin attribute to no-CORS, anonymous, or use-credentials state; an invalid present value defaults to anonymous. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Cross-origin state

Returned string.

• Unicode normalization, locale, grapheme clusters, malformed input, ambiguous syntax, and implementation-specific conventions can change text-processing results.
• Use finite inputs in the displayed units, preserve source measurements and assumptions, and independently verify consequential decisions.

Preserve the original text, test representative non-ASCII and malformed cases, and use a standards-aware parser or serializer when interoperability matters.

• CORS Allow-Origin Checker

  Check only whether Access-Control-Allow-Origin matches a supplied request Origin, including the wildcard restriction for credentialed requests.

• Loading Attribute Validator

  Check whether an HTML loading attribute is one of the recognized eager or lazy keywords, ASCII case-insensitively.

• Vary Parser

  Parse a Vary response header as a case-insensitive set of field names or the single wildcard value.