This attribute allows the elimination of parser-blocking JavaScript where the browser would have to load and evaluate scripts before continuing to parse. defer has a similar effect in this case.
This attribute explicitly indicates that certain operations should be blocked on the fetching of the script. The operations that are to be blocked must be a space-separated list of blocking attributes listed below.
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Normal script elements pass minimal information to the window.onerror for scripts which do not pass the standard CORS checks. To allow error logging for sites which use a separate domain for static media, use this attribute. See CORS settings attributes for a more descriptive explanation of its valid arguments.
This attribute allows the elimination of parser-blocking JavaScript where the browser would have to load and evaluate scripts before continuing to parse. async has a similar effect in this case.
A cryptographic nonce (number used once) to allow scripts in a script-src Content-Security-Policy. The server must generate a unique nonce value each time it transmits a policy. It is critical to provide a nonce that cannot be guessed as bypassing a resource's policy is otherwise trivial.
Indicates that the script is a "classic script", containing JavaScript code. Authors are encouraged to omit the attribute if the script refers to JavaScript code rather than specify a MIME type. JavaScript MIME types are listed in the IANA media types specification.
This value causes the code to be treated as a JavaScript module. The processing of the script contents is deferred. The charset and defer attributes have no effect. For information on using module, see our JavaScript modules guide. Unlike classic scripts, module scripts require the use of the CORS protocol for cross-origin fetching.
If present, its value must be an ASCII case-insensitive match for "utf-8". It's unnecessary to specify the charset attribute, because documents must use UTF-8, and the script element inherits its character encoding from the document.
Like the type attribute, this attribute identifies the scripting language in use. Unlike the type attribute, however, this attribute's possible values were never standardized. The type attribute should be used instead.
Scripts without async, defer or type="module" attributes, as well as inline scripts without the type="module" attribute, are fetched and executed immediately before the browser continues to parse the page.
The script should be served with the text/javascript MIME type, but browsers are lenient and only block them if the script is served with an image type (image/*), a video type (video/*), an audio type (audio/*), or text/csv. If the script is blocked, an error event is sent to the element; otherwise, a load event is sent.
Browsers that support the module value for the type attribute ignore any script with a nomodule attribute. That enables you to use module scripts while providing nomodule-marked fallback scripts for non-supporting browsers.
When importing modules in scripts, if you don't use the type=importmap feature, then each module must be imported using a module specifier that is either an absolute or relative URL. In the example below, the first module specifier ("./shapes/square.js") resolves relative to the base URL of the document, while the second is an absolute URL.
You can include render token inside a blocking attribute; the rendering of the page will be blocked till the script is fetched and executed. In the example below, we block rendering on an async script, so that the script doesn't block parsing but is guaranteed to be evaluated before rendering starts.
\n Indicates that the script is a \"classic script\", containing JavaScript code.\n Authors are encouraged to omit the attribute if the script refers to JavaScript code rather than specify a MIME type.\n JavaScript MIME types are listed in the IANA media types specification.\n
\n This value causes the code to be treated as a JavaScript module.\n The processing of the script contents is deferred.\n The charset and defer attributes have no effect.\n For information on using module, see our JavaScript modules guide.\n Unlike classic scripts, module scripts require the use of the CORS protocol for cross-origin fetching.\n
If present, its value must be an ASCII case-insensitive match for \"utf-8\". It's unnecessary to specify the charset attribute, because documents must use UTF-8, and the script element inherits its character encoding from the document.
Scripts without async, defer or type=\"module\" attributes, as well as inline scripts without the type=\"module\" attribute, are fetched and executed immediately before the browser continues to parse the page.
\n The script should be served with the text/javascript MIME type, but browsers are lenient and only block them if the script is served with an image type (image/*), a video type (video/*), an audio type (audio/*), or text/csv.\n If the script is blocked, an error event is sent to the element; otherwise, a load event is sent.\n
\n When importing modules in scripts, if you don't use the type=importmap feature, then each module must be imported using a module specifier that is either an absolute or relative URL.\n In the example below, the first module specifier (\"./shapes/square.js\") resolves relative to the base URL of the document, while the second is an absolute URL.\n
\n You can include render token inside a blocking attribute;\n the rendering of the page will be blocked till the script is fetched and executed. In the example below, we block rendering on an async script,\n so that the script doesn't block parsing but is guaranteed to be evaluated before rendering starts.\n
A script is essentially a list of instructions recorded with each transaction that describe how the next person wanting to spend the Bitcoins being transferred can gain access to them. The script for a typical Bitcoin transfer to destination Bitcoin address D simply encumbers future spending of the bitcoins with two things: the spender must provide
Scripting provides the flexibility to change the parameters of what's needed to spend transferred Bitcoins. For example, the scripting system could be used to require two private keys, or a combination of several keys, or even no keys at all.
A transaction is valid if nothing in the combined script triggers failure and the top stack item is True (non-zero) when the script exits. The party that originally sent the Bitcoins now being spent dictates the script operations that will occur last in order to release them for use in another transaction. The party wanting to spend them must provide the input(s) to the previously recorded script that results in the combined script completing execution with a true value on the top of the stack.
OP_CHECKSIG is used directly without first hashing the public key.This was used by early versions of Bitcoin where people paid directly to IP addresses, before Bitcoin addresses were introduced.scriptPubKeys of this transaction form are still recognized as payments to user by Bitcoin Core.The disadvantage of this transaction form is that the whole public key needs to be known in advance, implying longer payment addresses, and that it provides less protection in the event of a break in the ECDSA signature algorithm.
OP_RETURN immediately marks the script as invalid, guaranteeing that no scriptSig exists that could possibly spend that output. Thus the output can be immediately pruned from the UTXO set even if it has not been spent. eb31ca1a4cbd97c2770983164d7560d2d03276ae1aee26f12d7c2c6424252f29 is an example: it has a single output of zero value, thus giving the full 0.125BTC fee to the miner who mined the transaction without adding an entry to the UTXO set. You can also use OP_RETURN to add data to a transaction without the data ever appearing in the UTXO set, as seen in 1a2e22a717d626fc5db363582007c46924ae6b28319f07cb1b907776bd8293fc; P2Pool does this with the share chain hash txout in the coinbase of blocks it creates.
This transaction was successfully spent by 09f691b2263260e71f363d1db51ff3100d285956a40cc0e4f8c8c2c4a80559b1. The required data happened to be the Genesis block, and the given hash in the script was the genesis block header hashed twice with SHA-256. Note that while transactions like this are fun, they are not secure, because they do not contain any signatures and thus any transaction attempting to spend them can be replaced with a different transaction sending the funds somewhere else. be457b7860
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