by noromanba
2018-08-02 [2018/08/02 07:37:12]
get Signed INT32 max value 2147483647 w/ DOM API
@@ -1,119 +1,53 @@ /*- * @title v- * @description dumb jump to bottom of page; [Ctrl +] End alternatives+ * @title rounDOM 2147483647 + * @description get Signed INT32 max value w/ DOM API * @include http://* * @include https://*- * @license MIT License https://opensource.org/licenses/MIT+ * @contributor noromanba http://let.hatelabo.jp/noromanba/let/hLHUs7CEkec6 + * @contributor noromanba http://let.hatelabo.jp/noromanba/let/hLHVmL_ErMVx + * @contributor noromanba http://let.hatelabo.jp/noromanba/let/hLHVmL_RgoIK + * @license MIT License https://opensource.org/licenses/MIT * @javascript_url */-// via-// https://hail2u.net/blog/coding/window-scrollto-infinity-infinity.html--// TBD simulate End key press--/* for mobile and legacy browsers-javascript:window.scrollTo(0,Math.max.apply(null,[document.documentElement.scrollHeight,document.documentElement.clientHeight,document.body.scrollHeight,document.body.clientHeight]))-javascript:window.scrollTo(0,Number.MAX_SAFE_INTEGER)-javascript:window.scrollTo(0,Number.MAX_VALUE)-*/--// avoid Magic Number e.g.-// 99999..., 10000... and 1e100...(() => { 'use strict';- //*/ boring...- window.scrollTo(0, Math.max(...[- document.documentElement.scrollHeight,- document.documentElement.clientHeight,- document.body.scrollHeight,- document.body.clientHeight,- ]));- /*/- window.scrollTo(0, Number.MAX_SAFE_INTEGER || Infinity);- // XXX `Infinity` is fallback/workaround for IE (might be fixed) c.f.- // https://hail2u.net/blog/coding/window-scrollto-infinity-infinity.html- // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/MAX_SAFE_INTEGER- //- // You can use `Number.MAX_VALUE` BUT exponential;- // so hard to try decimalization before truncate c.f.- // https://stackoverflow.com/questions/18719775/parsing-and-converting-exponential-values-to-decimal-in-javascript- //- // FIXME `Number.MAX_SAFE_INTEGER` methods do not working on Firefox 58.0.2 Desktop- // expected scroll to bottom, but actual scroll to top; like this- // window.scrollTo(0, 0)- // perhaps Fx treated like a "finite values", `NaN` and +/-`Infinity` c.f.- // https://www.w3.org/TR/cssom-view/#dom-window-scroll- // https://www.w3.org/TR/cssom-view/#normalize-non-finite-values- // https://www.w3.org/TR/cssom-view/#webidl-values- //- // scrollTo restricted from 32-bit limit?- //- // Firefox 58.0.2 mobile works fine- // `Number.MAX_SAFE_INTEGER`, `Number.MAX_VALUE` and `1e100` (!)- //*/+ const wall = document.head || document.body || document.documentElement; + const sandbox = wall.appendChild(document.createElement('iframe')); + + // [^1] DOM w/ IEEE_754 details c.f. + // http://let.hatelabo.jp/noromanba/let/hLHUs7CEkec6 + // Firefox Desktop ignoring >Signed INT32 + // so you can't use `Number.MAX_SAFE_INTEGER` + let rounder = sandbox.contentWindow.document.body; + // needs get after set + rounder.style.zIndex = Number.MAX_SAFE_INTEGER; + const MAX_SAFE_SIGNED_INT32 = Number(rounder.style.zIndex); + + if (!console || !console.assert) { + window.prompt('Signed +INT32: 2147483647?', MAX_SAFE_SIGNED_INT32); + return; + } + console.assert([ + 0x7FFFFFFF, + -1 >>> 1, + 2 ** (32 - 1) - 1, + MAX_SAFE_SIGNED_INT32, + ].every(v => v === 2147483647)); })();-// DBG-// window.scrollTo() w/ constants X-Browser-//-// - Chromium 64.0.3282.167 32-bit arch-// - Firefox 58.0.2 32-bit arch-// - Edge mobile 1.0.0.1656 Blink 64-bit arch-// - Firefox mobile 58.0.2 64-bit arch-//-//-// Browser Compatibility Table-//-// [x] works-// [ ] like a finite, treated to `0`-// [-] not check yet-//-// | Browser | height | MAX_SAFE_INTEGER | MAX_VALUE | exponential | hex |-// |--------------|--------|------------------|-----------|-------------|-----|-// | Chromium | [x] | [x] | [ ] | [ ] | [x] |-// | Firefox | [x] | [ ] | [ ] | [ ] | [x] |-// | Edge mobi | [x] | [x] | [ ] | [ ] | [-] |-// | Firefox mobi | [x] | [x] | [x] | [x] | [-] |-//-// exponential: 1e100-// hex: 0xFFFFFFF (< signed 32-bit limit)-//-//-// IEEE 754[-2008] c.f.-// https://en.wikipedia.org/wiki/IEEE_754-// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isSafeInteger-//-// Number.MAX_SAFE_INTEGER // 9007199254740991-// Number.MAX_SAFE_INTEGER-// .toPrecision(16) // 9007199254740991-// 2 ** 53 - 1 // 9007199254740991-// Number.MAX_VALUE // 1.7976931348623157e+308-//-//-// MAX_VALUE truncates-//-// bitwise op 32-bit signed number c.f.-// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators#Signed_32-bit_integers-// Math.pow(2, 32 -1) // 2147483648-//-// Number.MAX_VALUE | 0 // 0-// ~~Number.MAX_VALUE // 0-// parseInt(Number.MAX_VALUE, 10) // 1-// Math.trunc(Number.MAX_VALUE) // 1.7976931348623157e+308-//-//-// Hex playing-//-// Number(0xFFFFFFFFFFFFFFFFF) // 295147905179352830000-// Number(0xFFFFFFFFFFFFFFFFF0) // 4.722366482869645e+21-//-// Chromium works-// window.scroll(0, '0x'.padEnd(Number.MAX_SAFE_INTEGER.toString().length, 'F'))+// DEV //-// Firefox works limit-// window.scrollTo(0, 0xFFFFFFF) // 268435455-// 2 ** 32 - 1 // 2147483648-// window.scrollTo(0, 0xFFFFFFF0) // 4294967280+// [1]: +// Signed INT32 +// https://en.wikipedia.org/wiki/IEEE_754 +// https://en.wikipedia.org/wiki/Single-precision_floating-point_format +// specs +// https://www.w3.org/TR/CSS2/visuren.html#propdef-z-index +// TODO CSS3 spec +// https://www.w3.org/Style/CSS/ +// same as `window.scroll*()`, X-Browsers reports +// http://let.hatelabo.jp/noromanba/let/hLHVmL_RgoIK +// https://www.w3.org/TR/cssom-view/#webidl-values
/*
* @title rounDOM 2147483647
* @description get Signed INT32 max value w/ DOM API
* @include http://*
* @include https://*
* @contributor noromanba http://let.hatelabo.jp/noromanba/let/hLHUs7CEkec6
* @contributor noromanba http://let.hatelabo.jp/noromanba/let/hLHVmL_ErMVx
* @contributor noromanba http://let.hatelabo.jp/noromanba/let/hLHVmL_RgoIK
* @license MIT License https://opensource.org/licenses/MIT
* @javascript_url
*/
(() => {
'use strict';
const wall = document.head || document.body || document.documentElement;
const sandbox = wall.appendChild(document.createElement('iframe'));
// [^1] DOM w/ IEEE_754 details c.f.
// http://let.hatelabo.jp/noromanba/let/hLHUs7CEkec6
// Firefox Desktop ignoring >Signed INT32
// so you can't use `Number.MAX_SAFE_INTEGER`
let rounder = sandbox.contentWindow.document.body;
// needs get after set
rounder.style.zIndex = Number.MAX_SAFE_INTEGER;
const MAX_SAFE_SIGNED_INT32 = Number(rounder.style.zIndex);
if (!console || !console.assert) {
window.prompt('Signed +INT32: 2147483647?', MAX_SAFE_SIGNED_INT32);
return;
}
console.assert([
0x7FFFFFFF,
-1 >>> 1,
2 ** (32 - 1) - 1,
MAX_SAFE_SIGNED_INT32,
].every(v => v === 2147483647));
})();
// DEV
//
// [1]:
// Signed INT32
// https://en.wikipedia.org/wiki/IEEE_754
// https://en.wikipedia.org/wiki/Single-precision_floating-point_format
// specs
// https://www.w3.org/TR/CSS2/visuren.html#propdef-z-index
// TODO CSS3 spec
// https://www.w3.org/Style/CSS/
// same as `window.scroll*()`, X-Browsers reports
// http://let.hatelabo.jp/noromanba/let/hLHVmL_RgoIK
// https://www.w3.org/TR/cssom-view/#webidl-values