How to differentiate between repaint
A repaint occurs when changes are made to elements that affect visibility but not the layout. For example, opacity, background-color, visibility, and outline. Repaints are expensive because the browser must check the visibility of all other nodes in the DOM — one or more may have become visible beneath the changed element.
and reflow
Reflows have a bigger impact. This refers to the re-calculation of positions and dimensions of all elements, which leads to re-rendering part or all of the document. Changing a single element can affect all children, ancestors, and siblings.
using chrome developer tools(or other similar tools)?
In Chrome Performance tab i see only repaint. repaint
