// count "\}" as "}" and move on, the script is already broken as
		// fully fledged parsers will just fail anyway.
		c.jsBraceDepth[len(c.jsBraceDepth)-1]--
		if c.jsBraceDepth[len(c.jsBraceDepth)-1] >= 0 {
			return c, i + 1
		}
		c.jsBraceDepth = c.jsBraceDepth[:len(c.jsBraceDepth)-1]
		c.state = stateJSTmplLit
	default:
		panic("unreachable")
	}
	return c, i + 1
}

type context struct {
	state   state
	delim   delim
	urlPart urlPart
	jsCtx   jsCtx
	// jsBraceDepth contains the current depth, for each JS template literal
	// string interpolation expression, of braces we've seen. This is used to
	// determine if the next } will close a JS template literal string
	// interpolation expression or not.
	jsBraceDepth []int
	attr         attr
	element      element