minor fixes

Author: iliakan

7-animation/2-css-animations/article.md

@@ -435,11 +435,11 @@ The `transform` property is a great choice, because:
 
 In other words, the browser calculates the Layout (sizes, positions), paints it with colors, backgrounds, etc at the Paint stage, and then applies `transform` to element boxes that need it.
 
-Changes (animations) of the `transform` property never cause Layout and Paint steps. More than that, the browser  leverages the graphics accelerator (a special chip on the CPU or graphics card) for CSS transforms, thus making them very effecient.
+Changes (animations) of the `transform` property never trigger Layout and Paint steps. More than that, the browser  leverages the graphics accelerator (a special chip on the CPU or graphics card) for CSS transforms, thus making them very effecient.
 
 Luckily, the `transform` property is very powerful. By using `transform` on an element, you could rotate and flip it, stretch and shrink it, move it around, and [much more](https://developer.mozilla.org/docs/Web/CSS/transform#syntax). So instead of `left/margin-left` properties we can use `transform: translateX(…)`, use `transform: scale` for increasing element size, etc.
 
-The `opacity` property also never causes Layout (also skips Paint in Mozilla Gecko). We can use it for show/hide or fade-in/fade-out effects.
+The `opacity` property also never triggers Layout (also skips Paint in Mozilla Gecko). We can use it for show/hide or fade-in/fade-out effects.
 
 Paring `transform` with `opacity` can usually solve most of our needs, providing fluid, good-looking animations.