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* Part of Pleiar.no - a collection of tools for nurses
*
* Copyright (C) Fagforbundet 2019
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
// @flow
const featureDetection = {
/**
* This performs feature detection on an element. It checks if a "token list"
* (like the a element's rel= attribute) supports a specific value, for
* instance if it supports rel="noopener".
*/
tokenSupports (source: DOMTokenList, check: string): boolean
{
let supported: boolean = false;
// We use $UnsafeRecast to work around flow not knowing about source.supports()
source = (source: $UnsafeRecast);
try
{
if(typeof(source.supports) === "function")
{
supported = source.supports(check);
}
}
catch(err) {} // eslint-disable-line
return supported;
},
/**
* Performs rel="" feature detection on the anchor element
*/
aSupportsRel(check: string): boolean
{
// We use $UnsafeRecast to work around flow not knowing about element.relList
const element = (document.createElement('a'): $UnsafeRecast);
Eif(element.relList !== undefined)
{
return featureDetection.tokenSupports(element.relList, check);
}
return false;
}
};
export default featureDetection;
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