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Ghost-017 2019-02-07 09:20:27 +08:00 • committed by GitHub
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2-ui/1-document/08-styles-and-classes/article.md
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@ -116,7 +116,7 @@ Sometimes we want to assign a style property, and later remove it.
For instance, to hide an element, we can set `elem.style.display = "none"`. For instance, to hide an element, we can set `elem.style.display = "none"`.
Then later we may want to remove the `style.display` as if it were not set. Instead of `delete elem.style.display` we should assign an empty line to it: `elem.style.display = ""`. Then later we may want to remove the `style.display` as if it were not set. Instead of `delete elem.style.display` we should assign an empty string to it: `elem.style.display = ""`.
```js run ```js run
// if we run this code, the <body> "blinks" // if we run this code, the <body> "blinks"
@ -207,7 +207,7 @@ For instance, here `style` doesn't see the margin:
</body> </body>
``` ```
...But what if we need, say, to increase the margin by 20px? We want the current value for the start. ...But what if we need, say, to increase the margin by 20px? We would want the current value of it.
There's another method for that: `getComputedStyle`. There's another method for that: `getComputedStyle`.
@ -281,7 +281,7 @@ Visited links may be colored using `:visited` CSS pseudoclass.
But `getComputedStyle` does not give access to that color, because otherwise an arbitrary page could find out whether the user visited a link by creating it on the page and checking the styles. But `getComputedStyle` does not give access to that color, because otherwise an arbitrary page could find out whether the user visited a link by creating it on the page and checking the styles.
JavaScript we may not see the styles applied by `:visited`. And also, there's a limitation in CSS that forbids to apply geometry-changing styles in `:visited`. That's to guarantee that there's no sideway for an evil page to test if a link was visited and hence to break the privacy. JavaScript may not see the styles applied by `:visited`. And also, there's a limitation in CSS that forbids to apply geometry-changing styles in `:visited`. That's to guarantee that there's no sideway for an evil page to test if a link was visited and hence to break the privacy.
``` ```
## Summary ## Summary