cy.trigger command cannot simulate real mouse events

[chuandeng]

Current behavior:

when we use trigger like below code the event object in page is "Event"

cy.get('.target').trigger('mousedown', { button: 0 })

use "ev instanceof MouseEvent" in mousedown event got result of false

Desired behavior:

When we use "ev instanceof MouseEvent" in the mousedown event callback function should get result of true

Test code to reproduce

our coed is on below

$('div').on('mousedown', function(ev){
  if (ev instanceof MouseEvent) {
     ...
  }else {
    ...
  }
})

Versions

Cypress Version 4.9
System: Mac, Catalina 10.15.5
Browser: Chrome Version 84.0.4147.89 (Official Build) (64-bit)

[mingyixu]

I had the same question. it not work, example

cy.xpath('//span[text()="target"]').trigger('mouseover');

[jennifer-shehane]

Duplicate of #5650