noscript JS-Disabled Fallback

Resolves HTML noscript fallback and parser treatment from the HTML parser scripting flag. With scripting enabled contents are text; with scripting disabled contents are markup. XML parsing and full content-model validation are outside this tool.

Description

Noscript provides fallback content according to the HTML parser’s scripting flag.

Noscript provides fallback content according to the HTML parser’s scripting flag. Enabled scripting changes how its contents are parsed, rather than merely hiding ordinary markup.^[1]

When to use noscript JS-Disabled Fallback

Use this for the following task: Resolves HTML noscript fallback and parser treatment from the HTML parser scripting flag. With scripting enabled contents are text; with scripting disabled contents are markup. XML parsing and full content-model validation are outside this tool.

Prepare the parsed attribute values, element states or ordered local lists requested below. Keep attribute presence separate from value.

How to use noscript JS-Disabled Fallback and understand its results

Prepare the parsed attribute values, element states or ordered local lists requested below. Keep attribute presence separate from value.
Enter scriptingEnabled, context using the field table, then run the tool.
Read fallbackEligible, contentsParsedAs, headContentRestricted. Interpret flags, units, ordering and placeholder values using the rules below.
Review any reported issue or failed check, correct the supplied values when appropriate, and verify the result in its intended context.

Input field	Meaning	Value type and bounds	Requirement
scriptingEnabled	Scripting Enabled	boolean	Required
context	Context	string; choose "head", "body"	Required

Supply the scripting flag and head/body context. Flag restricted head content only for head context with scripting disabled.^[2]

fallbackEligible = !scriptingEnabled; contentsParsedAs = enabled ? text : markup

This summarizes the declared operation. Units, indexing, inclusivity and exceptional cases are explained in the surrounding text.

Output field	Meaning	Value type
fallbackEligible	Fallback Eligible	boolean
contentsParsedAs	Contents Parsed As	string
headContentRestricted	Head Content Restricted	boolean

json

{
  "input": {
    "scriptingEnabled": false,
    "context": "body"
  },
  "output": {
    "fallbackEligible": true,
    "contentsParsedAs": "markup",
    "headContentRestricted": false
  }
}

Limitations and assumptions

XML parsing and full content-model conformance are excluded. The flag is a caller-supplied parser state, not a check of whether one script failed.

This evaluates supplied local information; it does not fetch a page or run a browser. Malformed requests produce input errors. A successfully evaluated request can still contain false flags, empty result lists or a result outside the supplied threshold; those outcomes have the meanings stated above.

Alternative or Complementary methods

Choose script defer/async Execution Order Table for this operation: Classifies execution scheduling of ordinary parser-inserted classic or module scripts. Async wins over defer; inline classic flags are ignored. This assumes scripting enabled and successful fetch/evaluation, without dynamic insertion or blocking attributes. For a complementary task, use Canvas Fallback Content Note for this operation: Determines canvas fallback in interactive visual media from caller-supplied canvas support and scripting state. Disabled scripting or disabled canvas support displays fallback. Printing/static media and accessibility subtree behavior are outside this profile.

Further background: HTML / accessibility reference: noscript JS-Disabled Fallback.

References

HTML / accessibility reference: noscript JS-Disabled Fallback — WHATWG
noscript JS-Disabled Fallback — tool.io

Similar or alternative tools

script defer/async Execution Order Table
Classifies execution scheduling of ordinary parser-inserted classic or module scripts. Async wins over defer; inline classic flags are ignored. This assumes scripting enabled and successful fetch/evaluation, without dynamic insertion or blocking attributes.
Canvas Fallback Content Note
Determines canvas fallback in interactive visual media from caller-supplied canvas support and scripting state. Disabled scripting or disabled canvas support displays fallback. Printing/static media and accessibility subtree behavior are outside this profile.