the intersectionobserver was designed to give you the most up to date values, but reading them won't force a brand new layout. The one that does log scrollY on the scroll event. (stack-overflow bug fixed in RC30.3) As you can see from this example AnimateHeight receives the information that it needs to adjust the content when the AnimateHeight component is triggered by changing state. What does the === comparison operator do? If you wanted to use the logical version of width, which property name would you choose? CSS functions such as calc can accept a value at runtime and execute operators such as multiplication, division, addition, subtraction, mutating values into a new ones. Q20. Q29. Change from default. congruity pronunciation. Here is an example of that. I am pretty sure that recalculation of the style is causing the difference. color P.S in tests of my production app that has the same characteristics as the fiddle, Firefox and Safari fared quite well with almost constant 60fps whereas Chrome was janky. Can somebody explain to me why window.innerHeight and window.innerWidth would force a layout? This article lists all the forms of unwanted complexity that creep into a CSS codebase. One reflow may from window resize itself, another reflow comes from getting window.innerWidth. Changingbackground-repeatdoes not trigger any geometry changes, which is good. _ moves an element completely out of the page's normal layout flow, like it is sitting on its own separate layer. Which choice would correctly display the image on the page? Which property and value would achieve this? But since it is a visual property, it will causepaintingto occur. Without changing the cursor (you have to comment that line), this gap is only 170ms. forceReflow Because any margin changes affect Layout, the browser has to re-calculate Paint and Composite as well, which makes an already expensive change take even more time. What does the === comparison operator do? Q33. Which browser is not based on Chromium? Which CSS property will not trigger layout recalculation? Sass APIs. Some elements, including
