Jint

Events and workers ​

Script-visible events use Jint's tree-aware event dispatcher. The supported families include mouse, pointer, keyboard, input, focus, wheel, composition, form, history, page-transition, and before-unload events. Event propagation follows the DOM tree and crosses supported shadow boundaries.

HTML event-handler attributes and properties share one slot, and activation methods produce trusted event sequences. Focus state, document.activeElement, autofocus, and keyboard focus traversal are implemented without a windowing system.

Diagnostics and dialogs ​

csharp
page.DialogOpened += (_, dialog) =>
{
    dialog.Accepted = true;
    dialog.PromptText = "answer";
};

The handler runs on the page thread; do not call back into the page from it. Without a handler, dialogs are dismissed. Dialogs do not block the page as a graphical browser dialog would.

Read script failures and console output from:

csharp
IReadOnlyList<PageError> errors = page.Errors;
IReadOnlyList<string> messages = page.ConsoleMessages;

Observers and workers ​

MutationObserver delivers at the microtask checkpoint. IntersectionObserver and ResizeObserver deliver initial entries using the synthetic box model. With no real layout, an observed target is reported once as fully intersecting or at its current synthetic size.

Dedicated Worker instances run on package-managed threads and use the page's network and security posture. Page.Workers reports the current count. SharedWorker and ServiceWorker are not supported.