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All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\n/** @type {Promise<void>} */\nlet readyPromise = null;\n\n/** @type {?function(?function())} */\nlet whenReady =\n (window['HTMLImports'] && window['HTMLImports']['whenReady']) || null;\n\n/** @type {function()} */\nlet resolveFn;\n\n/**\n * @param {?function()} callback\n */\nexport default function documentWait(callback) {\n requestAnimationFrame(function () {\n if (whenReady) {\n whenReady(callback);\n } else {\n if (!readyPromise) {\n readyPromise = new Promise((resolve) => {\n resolveFn = resolve;\n });\n if (document.readyState === 'complete') {\n resolveFn();\n } else {\n document.addEventListener('readystatechange', () => {\n if (document.readyState === 'complete') {\n resolveFn();\n }\n });\n }\n }\n readyPromise.then(function () {\n callback && callback();\n });\n }\n });\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. 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All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {MIXIN_MATCH, VAR_ASSIGN} from './common-regex.js';\n\n/**\n * @param {Element} element\n * @param {Object=} properties\n */\nexport function updateNativeProperties(element, properties) {\n // remove previous properties\n for (let p in properties) {\n // NOTE: for bc with shim, don't apply null values.\n if (p === null) {\n element.style.removeProperty(p);\n } else {\n element.style.setProperty(p, properties[p]);\n }\n }\n}\n\n/**\n * @param {Element} element\n * @param {string} property\n * @return {string}\n */\nexport function getComputedStyleValue(element, property) {\n /**\n * @const {string}\n */\n const value = window.getComputedStyle(element).getPropertyValue(property);\n if (!value) {\n return '';\n } else {\n return value.trim();\n }\n}\n\n/**\n * return true if `cssText` contains a mixin definition or consumption\n * @param {string} cssText\n * @return {boolean}\n */\nexport function detectMixin(cssText) {\n const has = MIXIN_MATCH.test(cssText) || VAR_ASSIGN.test(cssText);\n // reset state of the regexes\n MIXIN_MATCH.lastIndex = 0;\n VAR_ASSIGN.lastIndex = 0;\n return has;\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nexport const nativeShadow = !(\n window['ShadyDOM'] && window['ShadyDOM']['inUse']\n);\n/** @type {boolean} */\nlet nativeCssVariables_;\n\n/**\n * @param {(ShadyCSSOptions | ShadyCSSInterface)=} settings\n */\nfunction calcCssVariables(settings) {\n if (settings && settings.shimcssproperties) {\n nativeCssVariables_ = false;\n } else {\n // chrome 49 has semi-working css vars, check if box-shadow works\n // safari 9.1 has a recalc bug: https://bugs.webkit.org/show_bug.cgi?id=155782\n // However, shim css custom properties are only supported with ShadyDOM enabled,\n // so fall back on native if we do not detect ShadyDOM\n // Edge 15: custom properties used in ::before and ::after will also be used in the parent element\n // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/12414257/\n nativeCssVariables_ =\n nativeShadow ||\n Boolean(\n !navigator.userAgent.match(/AppleWebKit\\/601|Edge\\/15/) &&\n window.CSS &&\n CSS.supports &&\n CSS.supports('box-shadow', '0 0 0 var(--foo)')\n );\n }\n}\n\n/** @type {string | undefined} */\nexport let cssBuild;\nif (window.ShadyCSS && window.ShadyCSS.cssBuild !== undefined) {\n cssBuild = window.ShadyCSS.cssBuild;\n}\n\n/** @type {boolean} */\nexport const disableRuntime = Boolean(\n window.ShadyCSS && window.ShadyCSS.disableRuntime\n);\n\nif (window.ShadyCSS && window.ShadyCSS.nativeCss !== undefined) {\n nativeCssVariables_ = window.ShadyCSS.nativeCss;\n} else if (window.ShadyCSS) {\n calcCssVariables(window.ShadyCSS);\n // reset window variable to let ShadyCSS API take its place\n window.ShadyCSS = undefined;\n} else {\n calcCssVariables(window['WebComponents'] && window['WebComponents']['flags']);\n}\n\n// Hack for type error under new type inference which doesn't like that\n// nativeCssVariables is updated in a function and assigns the type\n// `function(): ?` instead of `boolean`.\nexport const nativeCssVariables = /** @type {boolean} */ (nativeCssVariables_);\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. 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