dialog::backdrop Open Method Lookup
Classifies closed, show/open nonmodal and showModal modal dialog states. Only modal dialogs enter the top layer and have a backdrop; actual appearance depends on CSS.
Description
A dialog can be closed, open nonmodally or opened modally.
A dialog can be closed, open nonmodally or opened modally. Modal dialogs participate in the top layer and are eligible for a backdrop.1
Classifies closed, show/open nonmodal and showModal modal dialog states. Only modal dialogs enter the top layer and have a backdrop; actual appearance depends on CSS.
When to use dialog::backdrop Open Method Lookup
Use this for the following task: Classifies closed, show/open nonmodal and showModal modal dialog states. Only modal dialogs enter the top layer and have a backdrop; actual appearance depends on CSS.
Prepare the parsed attribute values, element states or ordered local lists requested below. Keep attribute presence separate from value.
How to use dialog::backdrop Open Method Lookup and understand its results
- Prepare the parsed attribute values, element states or ordered local lists requested below. Keep attribute presence separate from value.
- Enter state using the field table, then run the tool.
- Read open, modal, backdropEligible, blocksDocument. 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 |
|---|---|---|---|
| state | State | string; choose "closed", "nonmodal", "modal" | Required |
Select the known state. Return modal, backdropEligible and blocksDocument only for modal state; nonmodal remains open without those flags.2
modal = state == modal; open = state != closed This summarizes the declared operation. Units, indexing, inclusivity and exceptional cases are explained in the surrounding text.
| Output field | Meaning | Value type |
|---|---|---|
| open | Open | boolean |
| modal | Modal | boolean |
| backdropEligible | Backdrop Eligible | boolean |
| blocksDocument | Blocks Document | boolean |
{
"input": {
"state": "modal"
},
"output": {
"open": true,
"modal": true,
"backdropEligible": true,
"blocksDocument": true
}
}Limitations and assumptions
Actual backdrop appearance depends on CSS. This does not open or close a live dialog.
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 inert Focus Suppression Lookup for this operation: Resolves inert attribute restrictions from own and inherited flat-tree inertness. A modal dialog opened with showModal escapes inherited inertness, while its own inert attribute still applies. Other disabling and focus rules are separate. For a complementary task, use Positive tabindex Anti-Pattern Check for this operation: Classifies an explicit parsed tabindex integer: positive values request an ordering priority, zero follows ordinary sequential order, negative requests exclusion from sequential navigation. Disabled, inert and browser focus preferences are outside this attribute-only check.
Further background: HTML / accessibility reference: dialog::backdrop Open Method Lookup.
References
Similar or alternative tools
- inert Focus Suppression Lookup
Resolves inert attribute restrictions from own and inherited flat-tree inertness. A modal dialog opened with showModal escapes inherited inertness, while its own inert attribute still applies. Other disabling and focus rules are separate.
- Positive tabindex Anti-Pattern Check
Classifies an explicit parsed tabindex integer: positive values request an ordering priority, zero follows ordinary sequential order, negative requests exclusion from sequential navigation. Disabled, inert and browser focus preferences are outside this attribute-only check.