ManifestThemeColorExtractor

Extract the raw theme_color string from manifest JSON, reporting whether it is present without applying browser fallback behavior.

Description

The manifest theme_color member supplies a suggested interface color.

The manifest theme_color member supplies a suggested interface color. Raw extraction differs from parsing CSS colors or applying browser fallback behavior.^[1]

Extract the raw theme_color string from manifest JSON, reporting whether it is present without applying browser fallback behavior.

When to use ManifestThemeColorExtractor

Use this tool to extract the raw theme_color string from manifest JSON, reporting whether it is present without applying browser fallback behavior.

Choose the URL, decoded source text, header value or explicit byte list requested by this tool. Paste the complete relevant input and follow its parsing and encoding conventions.

How to use ManifestThemeColorExtractor and understand its results

Choose the URL, decoded source text, header value or explicit byte list requested by this tool. Paste the complete relevant input and follow its parsing and encoding conventions.
Enter manifest using the field table and calculation rules, then run the tool.
Read value, found. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
manifest	Web application manifest JSON.	string; maximum length: 1000000	Required

Paste manifest JSON as text. Require a JSON object and, if theme_color exists, a string. Return that exact string with found=true, including an empty string. Missing membership returns empty value and found=false; a non-string member is an input error.

found=typeof manifest.theme_color==='string'; value=found ? theme_color : ''

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
value	Raw manifest member, empty when absent.	string; maximum length: 1000000
found	Whether a string member was present.	boolean

json

{
  "input": {
    "manifest": "{\"theme_color\":\"#336699\"}"
  },
  "output": {
    "value": "#336699",
    "found": true
  }
}

Limitations and assumptions

The color is not validated, normalized or compared with media-specific meta tags. No manifest fetching or browser UI behavior is simulated.

Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Extremely large text inputs are rejected. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors. A successfully returned false flag is an evaluated outcome; its meaning is explained above.

Alternative or Complementary methods

Use ManifestStartUrlExtractor: Extract the raw start_url string from manifest JSON, reporting whether it is present without applying browser fallback behavior. For a complementary task, use Manifest Display Validator: Validate a web application manifest display keyword without treating display_override extension values as display values.

References

ManifestThemeColorExtractor — tool.io

Similar or alternative tools

ManifestStartUrlExtractor
Extract the raw start_url string from manifest JSON, reporting whether it is present without applying browser fallback behavior.
Manifest Display Validator
Validate a web application manifest display keyword without treating display_override extension values as display values.