WebPrintingMimeMediaType

Syntax

enum WebPrintingMimeMediaType { "application/pdf" };

Inputs

Use this WebPrintingMimeMediaType value only in the containing typed dictionary; unsupported values are rejected at job submission.

Outputs

Declared document MIME values - currently only application/pdf (WebPrintingMimeMediaType). It appears in the containing API dictionary; it does not return a promise by itself.

Errors

Invalid WebPrintingMimeMediaType values fail normal Web IDL conversion or the containing print-job validation; no separate exception algorithm is specified for this standalone type.

Context and permission

Available only through the proposed Web Printing API in its required secure isolated Window context; this type creates no additional permission.

Lifecycle

Capability and state values are snapshots returned by printer/job operations. Refresh the containing attributes before relying on current hardware support.

Examples

Checking WebPrintingMimeMediaType support from printer attributes:

// Check WebPrintingMimeMediaType support from printer attributes.
const attributes = await printer.fetchAttributes();
console.log(attributes.documentFormatSupported);

Compatibility

Security and privacy

Capabilities and state can fingerprint a printer and reveal printing activity; avoid exposing them to untrusted code.

Sources

• WICG data model
• Chromium enum IDL
• Chromium Mojo data model
• ChromeStatus