what

const (
	// Invalid is the zero [What], returned by [Parse] for unrecognized input.
	//
	// It is neither a command nor an event, so [What.IsValid] reports false for it.
	Invalid What = iota

	// Update schedules dirty element processing.
	Update
	// Reload tells the browser to reload the current URL.
	Reload
	// Redirect tells the browser to load another URL.
	Redirect
	// Alert displays an alert message when the client UI supports it.
	Alert
	// Order reorders a set of elements.
	Order
	// Call calls a JavaScript function.
	Call

	// Set updates a JavaScript variable bound to the target element.
	//
	// Data uses the form path=json.
	Set
	// Inner sets the element's inner HTML.
	Inner
	// Delete deletes the element.
	Delete
	// Replace replaces the element with new HTML.
	Replace
	// Remove removes a child element; Data identifies child and Jid identifies parent.
	Remove
	// Insert inserts a child element.
	Insert
	// Append appends a child element.
	Append
	// SAttr sets an element attribute.
	SAttr
	// RAttr removes an element attribute.
	RAttr
	// SClass sets an element class.
	SClass
	// RClass removes an element class.
	RClass
	// Value sets an element value.
	Value

	// Input reports that an element value or input changed.
	Input
	// Click reports that an element was clicked.
	Click
	// ContextMenu reports that a context menu was requested on an element.
	ContextMenu

	// Hook synchronously invokes the matching event handler.
	//
	// Hook is a testing facility rather than part of the browser wire protocol:
	// the JaWS client never sends it, and inbound client messages are never
	// dispatched as Hook. Broadcasting a Hook message lets a test drive an
	// element's event handler synchronously, without round-tripping through the
	// client. The handler must not send messages of its own; any error it
	// returns is delivered to the client as an [Alert].
	Hook
)