As a self-administered survey mode, web surveys allow respondents to temporarily leave the survey page and switch to another web page in a different browser tab or to another window/app. This form of sequential multitasking has the potential to disrupt the response process and reduce data quality if respondents become distracted (Krosnick, 1991; Sendelbah et al., 2016). Browser data indicating respondents leaving the survey page allow non-reactive measurement of their multitasking. We investigated the prevalence of page switching, number of switching events and time spent absent per event with respect to respondents’ characteristics and devices used. Furthermore, we analysed the …