Handler
interface Handler {
onattribute(
name: string,
value: string,
quote?: string | undefined | null,
): void;oncdataend(): void;
oncdatastart(): void;
onclosetag(name: string): void;
oncomment(data: string): void;
oncommentend(): void;
onend(): void;
onerror(error: Error): void;
onopentag(name: string, attribs: {}): void;
[s: string]: string;
onopentagname(name: string): void;
onparserinit(parser: Parser): void;
onprocessinginstruction(name: string, data: string): void;
onreset(): void;
ontext(data: string): void;
}