target=_blank rel=opener Security Check
Resolves opener behavior requested by an anchor with target=_blank under modern HTML rules. Implicit noopener applies unless opener is present; noreferrer or noopener takes precedence.
Description
Modern anchors targeting a new context implicitly suppress opener access unless explicitly requested.
Modern anchors targeting a new context implicitly suppress opener access unless explicitly requested. The rel tokens noopener and noreferrer override an opener request.1
The tool returns blankTarget, openerRequested, referrerSuppressed. The fields describe the supplied local pattern or effective state, or contain the formatted markup shown below.
When to use target=_blank rel=opener Security Check
Use this for the following task: Resolves opener behavior requested by an anchor with target=_blank under modern HTML rules. Implicit noopener applies unless opener is present; noreferrer or noopener takes precedence. Provide the requested local fields extracted from the relevant element or attribute.
How to use target=_blank rel=opener Security Check and understand its results
- Prepare the parsed element names, attribute values or direct element-child lists requested below. Keep attribute presence separate from its value.
- Enter target, rel according to the field table, then run the tool.
- Read blankTarget, openerRequested, referrerSuppressed. Check the effective state, recognized-token flags or generated markup against the rules below.
- Correct any reported local mismatch and check the resulting markup in its intended document and browser context.
| Input field | Meaning | Value type and bounds | Requirement |
|---|---|---|---|
| target | Target | string; maximum text length 100000 | Required |
| rel | Rel | string; maximum text length 100000 | Required |
Supply parsed target and rel values. Match _blank without trimming, split rel on HTML ASCII whitespace and report blankTarget, openerRequested and referrerSuppressed.
openerRequested = target is _blank AND rel includes opener AND excludes noopener/noreferrer The symbols and boundary conditions refer to the supplied fields and the implementation described above.
| Output field | Meaning | Value type |
|---|---|---|
| blankTarget | Blank Target | boolean |
| openerRequested | Opener Requested | boolean |
| referrerSuppressed | Referrer Suppressed | boolean |
{
"input": {
"target": "_blank",
"rel": "opener"
},
"output": {
"blankTarget": true,
"openerRequested": true,
"referrerSuppressed": false
}
}Limitations and assumptions
This resolves the requested behavior from these attributes only. It does not open a context, inspect browser state or combine response-header isolation policies.
The tool does not fetch a page, run a browser or validate an entire HTML document. Malformed tool requests produce input errors; valid requests can still report unrecognized values or failed local checks.
Alternative or Complementary methods
Choose Anchor target Values Lookup when you need its operation: Classifies standard HTML navigable target keywords or valid named targets. Empty values default to the current context. Browser-specific target extensions are excluded. Choose referrerpolicy Values Table for the complementary operation: Resolves a referrerpolicy attribute to its standard keyword or the empty inherited-policy state. It does not compute referrer URLs or combine document headers and noreferrer.
Background reference: HTML Standard: target=_blank rel=opener Security Check.
References
Similar or alternative tools
- Anchor target Values Lookup
Classifies standard HTML navigable target keywords or valid named targets. Empty values default to the current context. Browser-specific target extensions are excluded.
- referrerpolicy Values Table
Resolves a referrerpolicy attribute to its standard keyword or the empty inherited-policy state. It does not compute referrer URLs or combine document headers and noreferrer.