Shadow DOM Style Scoping Note
Supported ShadowDOM style scope mechanisms, not assumed all styles/inheritance stopped at shadow boundary. Explicit supplied computed/layout context only; not a browser cascade/layout engine or cross-browser guarantee.
Description
Shadow-tree styling has boundaries and explicitly exposed entry points.
Shadow-tree styling has boundaries and explicitly exposed entry points.1
Host, slotted and part targeting serve different purposes rather than piercing every descendant. Use Shadow DOM Style Scoping Note to look up a supported term.
When to use Shadow DOM Style Scoping Note
Use Shadow DOM Style Scoping Note to look up a supported term. Choose the exact supported token from the table; preserve its punctuation and capitalization.
How to use Shadow DOM Style Scoping Note and understand its results
- Choose the exact supported token from the table; preserve its punctuation and capitalization.
- Enter Selector scope using the field table and validation rules below, then run the tool.
- Read Meaning and interpret units, signs, ordering and placeholders as explained below.
- If the tool reports an input error, correct that field and rerun. A successful false result, empty match list or unknown-evidence placeholder has the specific meaning described here; check the limitations before applying the result.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| selectorScope | Selector scope | string | Required; constraints below |
Enter one of the exact supported selectorScope tokens in the table below. The implementation performs a case-sensitive lookup and returns the stored meaning without interpreting a stylesheet, audio recording or performance. Unsupported tokens, added whitespace and alternate capitalization are input errors. The entries describe a bounded vocabulary rather than every valid value in the wider topic.
meaning = storedTable[exactSupportedToken] Field order, units and branch conditions follow the implementation explanation above.
| Exact supported token | Stored meaning |
|---|---|
| document | ordinary document selectors do not pierce a shadow tree |
| shadow | ordinary shadow selectors apply within their shadow tree |
| host | host pseudo-class targets the shadow host in shadow stylesheet context |
| slotted | slotted pseudo-element targets assigned slotted elements, not arbitrary deeper descendants |
| part | part pseudo-element can target explicitly exposed shadow parts |
| Output field | Meaning | Value type |
|---|---|---|
| meaning | Stored explanation for the exact supported token. | string |
{
"input": {
"selectorScope": "slotted"
},
"output": {
"meaning": "slotted pseudo-element targets assigned slotted elements, not arbitrary deeper descendants"
}
}Limitations and assumptions
Host, slotted and part targeting serve different purposes rather than piercing every descendant. Apply the exact scope and assumptions described above.
All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse arrays fail validation. Domain-specific bounds, alignments and supported tokens are stated above; extremely large inputs or outputs can also be rejected. These errors differ from successful results such as false, no matches or unknown evidence.
Alternative or Complementary methods
Use z-index Stacking Context Boundary Check for a related task: A stacking context groups local paint-order comparisons within a larger hierarchy.
Use contain Strictness Levels Lookup for a related task: Containment separates selected effects on layout, painting, sizing and style.
References
-
Shadow DOM Style Scoping Note — tool.io
Similar or alternative tools
- z-index Stacking Context Boundary Check
A stacking context groups local paint-order comparisons within a larger hierarchy.
- contain Strictness Levels Lookup
Containment separates selected effects on layout, painting, sizing and style.