- learn blockchain concepts
- learn ethereum
- learn how to use metamask
- learn how to use hardhat (https://hardhat.org/)
- learn how to deploy and interact with a smart contract
- learn common smart contract standards like ERC20 (token), ERC721 (nft), ERC1155 (opensea)
- learn ipfs
- learn how to read blockchain explorers like https://etherscan.io/
- learn how to use web3 and etherjs
- learn solidity
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/** | |
* A combined ref implementation using the callback ref cleanups feature. | |
* This will work in React 19. | |
*/ | |
import { Ref, useCallback } from 'react'; | |
type OptionalRef<T> = Ref<T> | undefined; | |
type Cleanup = (() => void) | undefined | void; |
All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.
Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.
elem.offsetLeft
,elem.offsetTop
,elem.offsetWidth
,elem.offsetHeight
,elem.offsetParent
On mac:
- Download the latest release.
- Extract the binary and place it in
/usr/local/bin
.
Test apparatus: http://jsfiddle.net/hRub4/
(Windows = Windows 8.1 desktop)
- Windows Chrome 39
- Button focuses on click and via keyboard tabbing
- Anchor focuses on click and via keyboard tabbing
- Windows Firefox 30.0
- Button focuses on click and via keyboard tabbing
- Anchor focuses on click and via keyboard tabbing
- Windows Internet Explorer 11