The top property of the ScrollToOptions dictionary specifies the number of pixels along the Y axis to scroll the window or element.
top: double
A double.
In our scrolltooptions example (see it live) we include a form that allows the user to enter three values — two numbers representing the left and top properties (i.e. the positions to scroll to along the X and Y axes), and a checkbox indicating whether they want smooth scrolling enabled or not.
When the form is submitted, an event handler is run that puts the entered values into a ScrollToOptions dictionary, and then invokes the Window.ScrollTo() method, passing the dictionary as a parameter:
form.addEventListener('submit', (e) => {
  e.preventDefault();
  scrollOptions = {
    left: leftInput.value,
    top: topInput.value,
    behavior: scrollInput.checked ? 'smooth' : 'auto'
  }
  window.scrollTo(scrollOptions);
}); | Specification | Status | Comment | 
|---|---|---|
| CSS Object Model (CSSOM) View Module The definition of 'top' in that specification.  |  Working Draft | 
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | 45 | No | Yes | No | 32 | No | 
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | 45 | 45 | No | Yes | 32 | No | Yes | 
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
    https://developer.mozilla.org/en-US/docs/Web/API/ScrollToOptions/top