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Below is a draft utilizing
fetch.fetch(document.documentURI) .then((response) => { const contentType = response.headers.get('content-type'); if (checkMediaType(contentType)) { return response.text(); } }) .then((data) => { renderFeed(data) })I've examined the following code, and I haven't found the ease and sensibility of coding with fetch significantly advantageous because of the following reasons:
fileURL.var xmlHTTPRequest, xmlFile, mimeType, isFeed; const mimeArray = [ 'application/atom+xml', 'application/stream+json', 'application/rss+xml', 'application/rdf+xml' ]; fetch(document.documentURI) .then((response) => { const contentType = response.headers.get('content-type'); if (!checkMediaType(contentType)) { throw new TypeError("Page does not seem to be a feed!"); } return response.arrayBuffer(); }) .then((data) => { let decoder = new TextDecoder(document.characterSet); let text = decoder.decode(data); renderFeed(text) }) function checkStatus(response) { if (response.status >= 200 && response.status < 300) { return Promise.resolve(response.responseText) } else { return Promise.reject(new Error(response.statusText)) } } // Check if is of type syndication feed function checkMediaType(mimeType) { if (!mimeType) { mimeType = 'text/plain'; } for (let i = 0; i < mimeArray.length; i++) { if (mimeType.includes(mimeArray[i]) ) { return true; } // Check if is application/xml or text/xml else if (mimeType.includes('/xml') || mimeType.includes('/html')) { const tagArray = ['feed', 'atom:link', 'rss', 'rdf:RDF']; for (let i = 0; i < tagArray.length; i++) { var query = document.getElementsByTagName(tagArray[i]); if (query.length) { return true; } } } // Check if is plain text (XPath only is usable) else if (mimeType.match('text/plain')) { const tagArray = ['<feed', '<atom:link', '<rss', '<rdf:RDF']; for (let i = 0; i < tagArray.length; i++) { query = ['//*[contains(text(), "' + tagArray[i] + '")]']; query = queryByXPath(query); if (query.length) { return true; } } } } } // Begin processing function renderFeed(xmlFile) { var domParser, xmlDocument, xsltProcessor, newDocument, head, style, isRTL, stylesheet_ltr, stylesheet_rtl, insertDocument, removeDocument; xmlFile = xmlFile .trim(); domParser = new DOMParser(); xmlDocument = domParser .parseFromString( xmlFile, 'text/xml' ); xsltProcessor = new XSLTProcessor(); xslFile = '<?xml version="1.0" encoding="UTF-8"?><xsl:stylesheet xmlns="http://purl.org/rss/1.0/" xmlns:admin="http://webns.net/mvcb/" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:atom10="http://www.w3.org/2005/Atom" xmlns:c="http://s.opencalais.com/1/pred/" xmlns:cc="http://web.resource.org/cc/" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dct="http://purl.org/dc/terms/" xmlns:dbo="http://dbpedia.org/ontology/" xmlns:dbp="http://dbpedia.org/property/" xmlns:enc="http://purl.oclc.org/net/rss_2.0/enc#" xmlns:fh="http://purl.org/syndication/history/1.0" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:foo="http://purl.org/rss/1.0/" xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#" xmlns:georss="http://www.georss.org/georss" xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" xmlns:media="http://search.yahoo.com/mrss/" xmlns:owl="http://www.w3.org/2002/07/owl#" xmlns:prov="http://www.w3.org/ns/prov#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:sioc="http://rdfs.org/sioc/ns#" xmlns:sioct="http://rdfs.org/sioc/types#" xmlns:skos="http://www.w3.org/2004/02/skos/core#" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" xmlns:syn="http://purl.org/rss/1.0/modules/syndication/" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"><xsl:output method="html" indent="yes" omit-xml-decleration="no"/><xsl:output media-type="application/atom+xml"/><xsl:template match="/atom:feed"><xsl:variable name="rtl" select="@xml:lang[ contains(self::node(),"ar") or contains(self::node(),"fa") or contains(self::node(),"he") or contains(self::node(),"ji") or contains(self::node(),"ku") or contains(self::node(),"ur") or contains(self::node(),"yi")]"/><html><head><xsl:call-template name="metadata"><xsl:with-param name="name" select=""description""/><xsl:with-param name="content" select="atom:subtitle"/></xsl:call-template><xsl:call-template name="metadata"><xsl:with-param name="name" select=""generator""/><xsl:with-param name="content" select=""syndication4humans https://sjehuda.github.io/""/></xsl:call-template><xsl:call-template name="metadata"><xsl:with-param name="name" select=""mimetype""/><xsl:with-param name="content" select=""application/atom+xml""/></xsl:call-template><title><xsl:choose><xsl:when test="atom:title and not(atom:title="")"><xsl:value-of select="atom:title"/></xsl:when><xsl:otherwise>Streamburner News Reader</xsl:otherwise></xsl:choose></title><xsl:if test="$rtl"><meta name="semitic" content="true"/></xsl:if></head><body><div id="feed"><header><div id="title"><xsl:choose><xsl:when test="atom:title and not(atom:title="")"><xsl:attribute name="title"><xsl:value-of select="atom:title"/></xsl:attribute><xsl:value-of select="atom:title"/></xsl:when><xsl:otherwise><div class="empty"/></xsl:otherwise></xsl:choose></div><div id="subtitle"><xsl:attribute name="title"><xsl:value-of select="atom:subtitle"/></xsl:attribute><xsl:value-of select="atom:subtitle"/></div></header><section id="links"><a title="Click to get the latest updates and news" onclick="location.href = "feed:" + location.href"></a><a title="Subscribe via SubToMe"><xsl:attribute name="href">https://www.subtome.com/#/subscribe?feeds=<xsl:value-of select="atom:link[@rel="self"]/@href"/></xsl:attribute><xsl:attribute name="onclick">(function(btn){var z=document.createElement("script");document.subtomeBtn=btn;z.src="https://www.subtome.com/load.js";document.body.appendChild(z);})(this);return false;</xsl:attribute></a><a title="Learn about syndication feed" onclick="document.getElementById("aboutfeed").classList.toggle("show");" class="popup"><span class="popuptext" id="aboutfeed"/></a><a href="https://wikiless.org/wiki/Template:Aggregators" title="Get a feed reader for desktop and mobile"/><a href="https://wikiless.org/wiki/RSS" title="Learn the benefits of using feeds for personal and corporates"/></section><xsl:choose><xsl:when test="atom:entry"><div id="toc"><xsl:for-each select="atom:entry[not(position() >20)]"><xsl:if test="atom:title"><xsl:element name="a"><xsl:attribute name="href"><xsl:text>#newspaper-oujs-</xsl:text><xsl:value-of select="position()"/></xsl:attribute><xsl:value-of select="atom:title"/></xsl:element></xsl:if></xsl:for-each></div></xsl:when></xsl:choose><section id="articles"><xsl:choose><xsl:when test="atom:entry"><xsl:for-each select="atom:entry[not(position() >20)]"><div class="entry"><xsl:if test="atom:title"><div class="title"><xsl:element name="a"><xsl:attribute name="href"><xsl:choose><xsl:when test="atom:link[contains(@rel,"alternate")]"><xsl:value-of select="atom:link[contains(@rel,"alternate")]/@href"/></xsl:when><xsl:otherwise><xsl:value-of select="atom:link/@href"/></xsl:otherwise></xsl:choose></xsl:attribute><xsl:attribute name="title"><xsl:value-of select="atom:title"/></xsl:attribute><xsl:attribute name="id"><xsl:text>newspaper-oujs-</xsl:text><xsl:value-of select="position()"/></xsl:attribute><xsl:value-of select="atom:title"/></xsl:element></div></xsl:if><xsl:choose><xsl:when test="geo:lat and geo:long"><xsl:variable name="lat" select="geo:lat"/><xsl:variable name="lng" select="geo:long"/><span class="geolocation"><a href="geo:{$lat},{$lng}">📍</a></span></xsl:when><xsl:when test="geo:Point"><xsl:variable name="lat" select="geo:Point/geo:lat"/><xsl:variable name="lng" select="geo:Point/geo:long"/><span class="geolocation"><a href="geo:{$lat},{$lng}">📍</a></span></xsl:when><xsl:when test="georss:point"><xsl:variable name="lat" select="substring-before(georss:point, " ")"/><xsl:variable name="lng" select="substring-after(georss:point, " ")"/><xsl:variable name="name" select="georss:featurename"/><span class="geolocation"><a href="geo:{$lat},{$lng}" title="{$name}">📍</a></span></xsl:when></xsl:choose><xsl:choose><xsl:when test="atom:updated"><div class="updated"><xsl:value-of select="atom:updated"/></div></xsl:when><xsl:when test="atom:published"><div class="published"><xsl:value-of select="atom:published"/></div></xsl:when><xsl:otherwise><div class="warning atom1 published"/></xsl:otherwise></xsl:choose><xsl:if test="atom:content or atom:summary"><div class="content"><xsl:choose><xsl:when test="atom:summary[contains(@type,"text")]"><xsl:attribute name="type"><xsl:value-of select="atom:summary/@type"/></xsl:attribute><xsl:value-of select="atom:summary"/></xsl:when><xsl:when test="atom:summary[contains(@type,"base64")]"></xsl:when><xsl:when test="atom:content[contains(@type,"text")]"><xsl:attribute name="type"><xsl:value-of select="atom:content/@type"/></xsl:attribute><xsl:value-of select="atom:content"/></xsl:when><xsl:when test="atom:content[contains(@type,"base64")]"></xsl:when><xsl:otherwise><xsl:choose><xsl:when test="atom:summary and not(atom:summary="")"><xsl:value-of select="atom:summary" disable-output-escaping="yes"/></xsl:when><xsl:otherwise><xsl:value-of select="atom:content" disable-output-escaping="yes"/></xsl:otherwise></xsl:choose></xsl:otherwise></xsl:choose></div></xsl:if><xsl:if test="atom:link[contains(@rel,"enclosure")]"><div class="enclosure" title="Right-click and Save link as…"><xsl:for-each select="atom:link[contains(@rel,"enclosure")]"><xsl:element name="span"><xsl:attribute name="icon"><xsl:value-of select="substring-before(@type,"/")"/></xsl:attribute></xsl:element><xsl:element name="a"><xsl:attribute name="href"><xsl:value-of select="@href"/></xsl:attribute><xsl:attribute name="download"/><xsl:call-template name="extract-filename"><xsl:with-param name="url" select="@href"/></xsl:call-template></xsl:element><xsl:element name="span"><xsl:attribute name="class"><xsl:value-of select="substring-before(@type,"/")"/></xsl:attribute></xsl:element><xsl:if test="@length > 0"><xsl:call-template name="transform-filesize"><xsl:with-param name="length" select="@length"/></xsl:call-template></xsl:if><xsl:element name="br"/></xsl:for-each><xsl:for-each select="media:content"><xsl:element name="span"><xsl:attribute name="icon"><xsl:value-of select="@medium"/></xsl:attribute></xsl:element><xsl:element name="a"><xsl:attribute name="href"><xsl:value-of select="@url"/></xsl:attribute><xsl:attribute name="download"/><xsl:call-template name="extract-filename"><xsl:with-param name="url" select="@url"/></xsl:call-template></xsl:element><xsl:element name="span"><xsl:attribute name="class"><xsl:value-of select="@medium"/></xsl:attribute></xsl:element><xsl:if test="@fileSize > 0"><xsl:call-template name="transform-filesize"><xsl:with-param name="length" select="@fileSize"/></xsl:call-template></xsl:if><xsl:element name="br"/></xsl:for-each></div></xsl:if></div><xsl:if test="not(atom:id)"><div class="warning atom1 id"/></xsl:if></xsl:for-each></xsl:when><xsl:otherwise><div class="notice no-entry"/></xsl:otherwise></xsl:choose></section></div></body></html></xsl:template><xsl:output media-type="application/rdf+xml"/><xsl:template match="/rdf:RDF"><xsl:variable name="rtl" select="channel/language[ contains(text(),"ar") or contains(text(),"fa") or contains(text(),"he") or contains(text(),"ji") or contains(text(),"ku") or contains(text(),"ur") or contains(text(),"yi")]"/><html><head><xsl:call-template name="metadata"><xsl:with-param name="name" select=""description""/><xsl:with-param name="content" select="foo:channel/foo:description"/></xsl:call-template><xsl:call-template name="metadata"><xsl:with-param name="name" select=""generator""/><xsl:with-param name="content" select=""syndication4humans https://sjehuda.github.io/""/></xsl:call-template><xsl:call-template name="metadata"><xsl:with-param name="name" select=""mimetype""/><xsl:with-param name="content" select=""application/rdf+xml""/></xsl:call-template><title><xsl:choose><xsl:when test="foo:channel/foo:title and not(foo:channel/foo:title="")"><xsl:value-of select="foo:channel/foo:title"/></xsl:when><xsl:otherwise>Streamburner News Reader</xsl:otherwise></xsl:choose></title><xsl:if test="$rtl"><meta name="semitic" content="true"/></xsl:if></head><body><div id="feed"><header><div id="title"><xsl:choose><xsl:when test="foo:channel/foo:title and not(foo:channel/foo:title="")"><xsl:attribute name="title"><xsl:value-of select="foo:channel/foo:title"/></xsl:attribute><xsl:value-of select="foo:channel/foo:title"/></xsl:when><xsl:otherwise><div class="empty"/></xsl:otherwise></xsl:choose></div><xsl:choose><xsl:when test="foo:channel/itunes:subtitle"><div id="subtitle"><xsl:attribute name="title"><xsl:value-of select="foo:channel/itunes:subtitle"/></xsl:attribute><xsl:value-of select="foo:channel/itunes:subtitle"/></div></xsl:when><xsl:when test="foo:channel/foo:description"><div id="subtitle"><xsl:attribute name="title"><xsl:value-of select="foo:channel/foo:description"/></xsl:attribute><xsl:value-of select="foo:channel/foo:description"/></div></xsl:when></xsl:choose></header><section id="links"><a title="Click to get the latest updates and news" onclick="location.href = "feed:" + location.href"></a><a title="Subscribe via SubToMe"><xsl:attribute name="href">https://www.subtome.com/#/subscribe?feeds=<xsl:value-of select="atom:link[@rel="self"]/@href"/></xsl:attribute><xsl:attribute name="onclick">(function(btn){var z=document.createElement("script");document.subtomeBtn=btn;z.src="https://www.subtome.com/load.js";document.body.appendChild(z);})(this);return false;</xsl:attribute></a><a title="Learn about syndication feed" onclick="document.getElementById("aboutfeed").classList.toggle("show");" class="popup"><span class="popuptext" id="aboutfeed"/></a><a href="https://wikiless.org/wiki/Template:Aggregators" title="Get a feed reader for desktop and mobile"/><a href="https://wikiless.org/wiki/RSS" title="Learn the benefits of using feeds for personal and corporates"/></section><xsl:choose><xsl:when test="foo:item"><div id="toc"><xsl:for-each select="foo:item[not(position() >20)]"><xsl:choose><xsl:when test="itunes:subtitle"><xsl:element name="a"><xsl:attribute name="href"><xsl:text>#newspaper-oujs-</xsl:text><xsl:value-of select="position()"/></xsl:attribute><xsl:value-of select="itunes:subtitle"/></xsl:element></xsl:when><xsl:when test="foo:title"><xsl:element name="a"><xsl:attribute name="href"><xsl:text>#newspaper-oujs-</xsl:text><xsl:value-of select="position()"/></xsl:attribute><xsl:value-of select="foo:title"/></xsl:element></xsl:when></xsl:choose></xsl:for-each></div></xsl:when></xsl:choose><section id="articles"><xsl:choose><xsl:when test="foo:item"><xsl:for-each select="foo:item[not(position() >20)]"><div class="entry"><xsl:choose><xsl:when test="itunes:subtitle"><div class="title"><xsl:element name="a"><xsl:attribute name="href"><xsl:value-of select="foo:link"/></xsl:attribute><xsl:attribute name="title"><xsl:value-of select="itunes:subtitle"/></xsl:attribute><xsl:attribute name="id"><xsl:text>newspaper-oujs-</xsl:text><xsl:value-of select="position()"/></xsl:attribute><xsl:value-of select="itunes:subtitle"/></xsl:element></div></xsl:when><xsl:when test="foo:title"><div class="title"><xsl:element name="a"><xsl:attribute name="href"><xsl:value-of select="foo:link"/></xsl:attribute><xsl:attribute name="title"><xsl:value-of select="foo:title"/></xsl:attribute><xsl:attribute name="id"><xsl:text>newspaper-oujs-</xsl:text><xsl:value-of select="position()"/></xsl:attribute><xsl:value-of select="foo:title"/></xsl:element></div></xsl:when><xsl:otherwise><div class="warning rss title"/></xsl:otherwise></xsl:choose><xsl:choose><xsl:when test="geo:lat and geo:long"><xsl:variable name="lat" select="geo:lat"/><xsl:variable name="lng" select="geo:long"/><span class="geolocation"><a href="geo:{$lat},{$lng}">📍</a></span></xsl:when><xsl:when test="geo:Point"><xsl:variable name="lat" select="geo:Point/geo:lat"/><xsl:variable name="lng" select="geo:Point/geo:long"/><span class="geolocation"><a href="geo:{$lat},{$lng}">📍</a></span></xsl:when><xsl:when test="georss:point"><xsl:variable name="lat" select="substring-before(georss:point, " ")"/><xsl:variable name="lng" select="substring-after(georss:point, " ")"/><xsl:variable name="name" select="georss:featurename"/><span class="geolocation"><a href="geo:{$lat},{$lng}" title="{$name}">📍</a></span></xsl:when></xsl:choose><xsl:if test="dc:date"><div class="published"><xsl:value-of select="dc:date"/></div></xsl:if><xsl:choose><xsl:when test="content:encoded"><div class="content"><xsl:value-of select="content:encoded" disable-output-escaping="yes"/></div></xsl:when><xsl:when test="foo:description"><div class="content"><xsl:value-of select="foo:description" disable-output-escaping="yes"/></div></xsl:when><xsl:when test="itunes:summary"><div class="content"><xsl:value-of select="itunes:summary" disable-output-escaping="yes"/></div></xsl:when><xsl:otherwise><div class="warning rss description"/></xsl:otherwise></xsl:choose><xsl:if test="enc:enclosure"><div class="enclosure" title="Right-click and Save link as…"><xsl:for-each select="enc:enclosure"><xsl:element name="span"><xsl:attribute name="icon"><xsl:value-of select="substring-before(@enc:type,"/")"/></xsl:attribute></xsl:element><xsl:element name="a"><xsl:attribute name="href"><xsl:value-of select="@rdf:resource"/></xsl:attribute><xsl:attribute name="download"/><xsl:call-template name="extract-filename"><xsl:with-param name="url" select="@rdf:resource"/></xsl:call-template></xsl:element><xsl:element name="span"><xsl:attribute name="class"><xsl:value-of select="substring-before(@enc:type,"/")"/></xsl:attribute></xsl:element><xsl:if test="@enc:length > 0"><xsl:call-template name="transform-filesize"><xsl:with-param name="length" select="@enc:length"/></xsl:call-template></xsl:if><xsl:element name="br"/></xsl:for-each></div></xsl:if></div></xsl:for-each></xsl:when><xsl:otherwise><div class="notice no-entry"/></xsl:otherwise></xsl:choose></section></div></body></html></xsl:template><xsl:output media-type="application/rss+xml"/><xsl:template match="/rss"><xsl:variable name="rtl" select="channel/language[ contains(text(),"ar") or contains(text(),"fa") or contains(text(),"he") or contains(text(),"ji") or contains(text(),"ku") or contains(text(),"ur") or contains(text(),"yi")]"/><html><head><xsl:call-template name="metadata"><xsl:with-param name="name" select=""description""/><xsl:with-param name="content" select="channel/description"/></xsl:call-template><xsl:call-template name="metadata"><xsl:with-param name="name" select=""generator""/><xsl:with-param name="content" select=""syndication4humans https://sjehuda.github.io/""/></xsl:call-template><xsl:call-template name="metadata"><xsl:with-param name="name" select=""mimetype""/><xsl:with-param name="content" select=""application/rss+xml""/></xsl:call-template><title><xsl:choose><xsl:when test="channel/title and not(channel/title="")"><xsl:value-of select="channel/title"/></xsl:when><xsl:otherwise>Streamburner News Reader</xsl:otherwise></xsl:choose></title><xsl:if test="$rtl"><meta name="semitic" content="true"/></xsl:if></head><body><div id="feed"><header><div id="title"><xsl:choose><xsl:when test="channel/title and not(channel/title="")"><xsl:attribute name="title"><xsl:value-of select="channel/title"/></xsl:attribute><xsl:value-of select="channel/title"/></xsl:when><xsl:otherwise><div class="empty"/></xsl:otherwise></xsl:choose></div><xsl:choose><xsl:when test="channel/itunes:subtitle"><div id="subtitle"><xsl:attribute name="title"><xsl:value-of select="channel/itunes:subtitle"/></xsl:attribute><xsl:value-of select="channel/itunes:subtitle"/></div></xsl:when><xsl:when test="channel/description"><div id="subtitle"><xsl:attribute name="title"><xsl:value-of select="channel/description"/></xsl:attribute><xsl:value-of select="channel/description"/></div></xsl:when></xsl:choose></header><section id="links"><a title="Click to get the latest updates and news" onclick="location.href = "feed:" + location.href"></a><a title="Subscribe via SubToMe"><xsl:attribute name="href">https://www.subtome.com/#/subscribe?feeds=<xsl:value-of select="atom:link[@rel="self"]/@href"/></xsl:attribute><xsl:attribute name="onclick">(function(btn){var z=document.createElement("script");document.subtomeBtn=btn;z.src="https://www.subtome.com/load.js";document.body.appendChild(z);})(this);return false;</xsl:attribute></a><a title="Learn about syndication feed" onclick="document.getElementById("aboutfeed").classList.toggle("show");" class="popup"><span class="popuptext" id="aboutfeed"/></a><a href="https://wikiless.org/wiki/Template:Aggregators" title="Get a feed reader for desktop and mobile"/><a href="https://wikiless.org/wiki/RSS" title="Learn the benefits of using feeds for personal and corporates"/></section><xsl:choose><xsl:when test="channel/item"><div id="toc"><xsl:for-each select="channel/item[not(position() >20)]"><xsl:choose><xsl:when test="itunes:subtitle"><xsl:element name="a"><xsl:attribute name="href"><xsl:text>#newspaper-oujs-</xsl:text><xsl:value-of select="position()"/></xsl:attribute><xsl:value-of select="itunes:subtitle"/></xsl:element></xsl:when><xsl:when test="title"><xsl:element name="a"><xsl:attribute name="href"><xsl:text>#newspaper-oujs-</xsl:text><xsl:value-of select="position()"/></xsl:attribute><xsl:value-of select="title"/></xsl:element></xsl:when></xsl:choose></xsl:for-each></div></xsl:when></xsl:choose><section id="articles"><xsl:choose><xsl:when test="channel/item"><xsl:for-each select="channel/item[not(position() >20)]"><div class="entry"><xsl:choose><xsl:when test="itunes:subtitle"><div class="title"><xsl:element name="a"><xsl:attribute name="href"><xsl:value-of select="link"/></xsl:attribute><xsl:attribute name="title"><xsl:value-of select="itunes:subtitle"/></xsl:attribute><xsl:attribute name="id"><xsl:text>newspaper-oujs-</xsl:text><xsl:value-of select="position()"/></xsl:attribute><xsl:value-of select="itunes:subtitle"/></xsl:element></div></xsl:when><xsl:when test="title"><div class="title"><xsl:element name="a"><xsl:attribute name="href"><xsl:value-of select="link"/></xsl:attribute><xsl:attribute name="title"><xsl:value-of select="title"/></xsl:attribute><xsl:attribute name="id"><xsl:text>newspaper-oujs-</xsl:text><xsl:value-of select="position()"/></xsl:attribute><xsl:value-of select="title"/></xsl:element></div></xsl:when><xsl:otherwise><div class="warning rss2 title"/></xsl:otherwise></xsl:choose><xsl:choose><xsl:when test="geo:lat and geo:long"><xsl:variable name="lat" select="geo:lat"/><xsl:variable name="lng" select="geo:long"/><span class="geolocation"><a href="geo:{$lat},{$lng}">📍</a></span></xsl:when><xsl:when test="geo:Point"><xsl:variable name="lat" select="geo:Point/geo:lat"/><xsl:variable name="lng" select="geo:Point/geo:long"/><span class="geolocation"><a href="geo:{$lat},{$lng}">📍</a></span></xsl:when><xsl:when test="georss:point"><xsl:variable name="lat" select="substring-before(georss:point, " ")"/><xsl:variable name="lng" select="substring-after(georss:point, " ")"/><xsl:variable name="name" select="georss:featurename"/><span class="geolocation"><a href="geo:{$lat},{$lng}" title="{$name}">📍</a></span></xsl:when></xsl:choose><xsl:if test="pubDate"><div class="published"><xsl:value-of select="pubDate"/></div></xsl:if><xsl:choose><xsl:when test="content:encoded"><div class="content"><xsl:value-of select="content:encoded" disable-output-escaping="yes"/></div></xsl:when><xsl:when test="description"><div class="content"><xsl:value-of select="description" disable-output-escaping="yes"/></div></xsl:when><xsl:when test="itunes:summary"><div class="content"><xsl:value-of select="itunes:summary" disable-output-escaping="yes"/></div></xsl:when><xsl:otherwise><div class="warning rss2 description"/></xsl:otherwise></xsl:choose><xsl:if test="enclosure or media:content"><div class="enclosure" title="Right-click and Save link as…"><xsl:for-each select="enclosure"><xsl:element name="span"><xsl:attribute name="icon"><xsl:value-of select="substring-before(@type,"/")"/></xsl:attribute></xsl:element><xsl:element name="a"><xsl:attribute name="href"><xsl:value-of select="@url"/></xsl:attribute><xsl:attribute name="download"/><xsl:call-template name="extract-filename"><xsl:with-param name="url" select="@url"/></xsl:call-template></xsl:element><xsl:element name="span"><xsl:attribute name="class"><xsl:value-of select="substring-before(@type,"/")"/></xsl:attribute></xsl:element><xsl:if test="@length > 0"><xsl:call-template name="transform-filesize"><xsl:with-param name="length" select="@length"/></xsl:call-template></xsl:if><xsl:element name="br"/></xsl:for-each><xsl:for-each select="media:content"><xsl:element name="span"><xsl:attribute name="icon"><xsl:value-of select="@medium"/></xsl:attribute></xsl:element><xsl:element name="a"><xsl:attribute name="href"><xsl:value-of select="@url"/></xsl:attribute><xsl:attribute name="download"/><xsl:call-template name="extract-filename"><xsl:with-param name="url" select="@url"/></xsl:call-template></xsl:element><xsl:element name="span"><xsl:attribute name="class"><xsl:value-of select="@medium"/></xsl:attribute></xsl:element><xsl:if test="@fileSize > 0"><xsl:call-template name="transform-filesize"><xsl:with-param name="length" select="@fileSize"/></xsl:call-template></xsl:if><xsl:element name="br"/></xsl:for-each></div></xsl:if></div></xsl:for-each></xsl:when><xsl:otherwise><div class="notice no-entry"/></xsl:otherwise></xsl:choose></section></div></body></html></xsl:template><xsl:template name="metadata"><xsl:param name="name"/><xsl:param name="content"/><xsl:if test="$content and not($content="")"><xsl:element name="meta"><xsl:attribute name="name"><xsl:value-of select="$name"/></xsl:attribute><xsl:attribute name="content"><xsl:value-of select="$content"/></xsl:attribute></xsl:element></xsl:if></xsl:template><xsl:template name="extract-filename"><xsl:param name="url"/><xsl:choose><xsl:when test="substring($url, string-length($url) - string-length("/") + 1) = "/""><xsl:value-of select="substring-after(substring($url, 1, string-length($url) - 1),"://")"/></xsl:when><xsl:otherwise><xsl:choose><xsl:when test="contains($url,"/") and contains(substring-after($url,"/"),".")"><xsl:call-template name="extract-filename"><xsl:with-param name="url" select="substring-after($url,"/")"/></xsl:call-template></xsl:when><xsl:otherwise><xsl:value-of select="$url"/></xsl:otherwise></xsl:choose></xsl:otherwise></xsl:choose></xsl:template><xsl:template name="transform-filesize"><xsl:param name="length"/><xsl:choose><xsl:when test="$length < 2"><xsl:value-of select="$length"/>Byte</xsl:when><xsl:when test="floor($length div 1024) < 1"><xsl:value-of select="$length"/>Bytes</xsl:when><xsl:when test="floor($length div (1024 * 1024)) < 1"><xsl:value-of select="floor($length div 1024)"/>.<xsl:value-of select="substring($length mod 1024,0,2)"/>KiB</xsl:when><xsl:when test="floor($length div (1024 * 1024 * 1024)) < 1"><xsl:value-of select="floor($length div (1024 * 1024))"/>.<xsl:value-of select="substring($length mod (1024 * 1024),0,2)"/>MiB</xsl:when><xsl:otherwise><xsl:value-of select="floor($length div (1024 * 1024 * 1024))"/>.<xsl:value-of select="substring($length mod (1024 * 1024 * 1024),0,2)"/>GiB</xsl:otherwise></xsl:choose></xsl:template></xsl:stylesheet>'; xsltStylesheet = domParser .parseFromString( xslFile, 'application/xml' // application/xslt+xml or text/xsl are Not Valid ); xsltProcessor .importStylesheet( xsltStylesheet ); newDocument = xsltProcessor .transformToDocument( xmlDocument ); // FIXME // Blocked due to server policy // https://archlinux.org/feeds/packages/ // https://www.openstreetmap.org/traces/rss // https://gultsch.social/@daniel.rss // NOTE // We can use inline style (i.e. style="") // but that would make the code lesser manageable stylesheet_ltr = "html,body{padding:0;margin:0}body{background:WhiteSmoke;color:#333;hyphens:auto}header{margin:0 -1em 1em -1em;margin-bottom:1em;padding:1em 1em 0 1em}#feed{min-width:400px;overflow:auto;position:relative}*{max-width:100%;object-fit:contain;height:auto}#logo{display:inline-block;float:left;overflow:hidden;position:relative;height:60px;width:60px;margin-right:9;padding-top:12}#logo>a>img{margin:auto;max-width:100%;position:absolute;width:5em;bottom:0;right:0;left:0;top:0}#title{font-variant:small-caps;text-align:center}#title{font-weight:bold;margin-bottom:0;overflow:hidden;-webkit-line-clamp:2;white-space:nowrap;margin:0;font-size:2.2em}#title .empty:before{font-variant:small-caps;content:'Streamburner News Dashboard';text-align:center}#subtitle{overflow:hidden;-webkit-line-clamp:2;white-space:wrap;font-weight:bold;font-size:1.5em;text-align:center;font-variant:small-caps}.container{display:flex}#links{border-top:.1em solid;margin:auto;width:50%;text-align:center;direction:ltr}#links>a{padding:10px;text-decoration:none;font-size:70%}#links>a:nth-child(1):after{content:'Follow';cursor:pointer;border-color:grey;border-left-style:solid;border-radius:1px;padding:6px;background:#eee !important}#links>a:nth-child(2):after{content:'SubToMe';cursor:pointer}#links>a:nth-child(3):after{content:'What’s This?';cursor:help}#links>a:nth-child(4):after{content:'Get a News Reader'}#links>a:nth-child(5):after{content:'More Info...'}#toc{margin-left:3%;padding:5px}#toc:before{content:'Latest Updates';font-size:76%;font-weight:bold}#toc>a{text-decoration:none;font-size:66%;display:block;padding:5px 0;margin-left:1%}#toc>a:hover{text-decoration:underline}#toc>a:visited{text-decoration:line-through}.popup{position:relative;display:inline-block;cursor:pointer}.popup .popuptext{visibility:hidden;width:160px;color:#fff;border-radius:6px;padding:18px;position:absolute;z-index:1;background-color:#555;position:absolute;right:4%;position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);width:50%;text-align:left}.popup .popuptext:after{content:'📰 Web Syndication News Feed \\A\\A ' ' Syndication Feed is a mean for content and media publishers ' 'to reach a wider audience easily. ' ' It allows you to receive information directly without the ' 'going from site to site. \\A\\A ' ' Essentially, a feed is a function that allows “Feed Readers” ' 'to access multiple websites automatically looking for new ' 'content and then posting the information about new content ' 'and updates to another website, mobile app or desktop software ' 'at the office. \\A\\A ' ' Feeds provide a way for users to keep up with the latest ' 'news, events and package and delivery status information ' 'posted on different websites such as social networks, torrent ' 'indexers or podcasts in one spot.';white-space:pre-wrap;line-height:1.8;font-size:150%}.popup .show{visibility:visible;-webkit-animation:fadeIn 1s;animation:fadeIn 1s}@-webkit-keyframes fadeIn{from{opacity:0}to{opacity:1}}@keyframes fadeIn{from{opacity:0}to{opacity:1}}#articles{justify-content:space-between;max-width:90%;margin:0 auto;padding:10px 0}#articles>*{margin:.5em;white-space:normal;vertical-align:top;margin-bottom:50px}.entry{border-bottom:inset;margin-left:auto;margin-right:auto;overflow:auto;line-height:1.6;font-size:85%;overflow-x:hidden}.entry:hover{background:#f8f9fa}.entry *{max-width:98%}.entry>a{white-space:normal}.title{cursor:pointer;display:inline-block;font-size:110%;font-weight:bold;text-decoration:underline;overflow:visible;text-overflow:ellipsis;white-space:nowrap;font-variant:small-caps}a{color:#333;display:inline-block}.geolocation>a{text-decoration:none;padding-left:6px}.author{font-size:75%;margin:0 auto 0 auto}.author:before{content:'By '}.author:after{content:' / '}.published,.updated{font-size:75%;margin:0 auto 0 auto}.content{margin:15px auto 15px 1%;inline-size:95%;text-indent:3px}.content[type='text']{font-family:monospace}code{overflow:auto;display:block;max-height:300px;border-radius:4px}.enclosure{background:#eee;border:1px solid GrayText;border-radius:4px;clear:both;color:#525c66;cursor:help;direction:ltr;font-size:.8em;margin:5px auto 15px 1%;padding:15px;vertical-align:middle;border:1px solid #aaa;border-radius:.5em;max-width:100%;moz-border-radius:.5em;padding:1em}.enclosure>span:after{content:' (Document file) '}.enclosure>span.executable:after{content:' (Executable file) '}.enclosure>span.image:after{content:' (Image file) '}.enclosure>span.audio:after{content:' (Audio file) '}.enclosure>span.video:after{content:' (Video file) '}.enclosure>span[icon]:after{content:'📄️';margin:3px}.enclosure>span[icon='executable']:after{content:'📦️';margin:3px}.enclosure>span[icon='image']:after{content:'🖼️';margin:3px}.enclosure>span[icon='audio']:after{content:'🎼️';margin:3px}.enclosure>span[icon='video']:after{content:'📽️';margin:3px}.notice{text-align:center;display:block;font-size:130%;font-weight:lighter;font-variant-caps:small-caps;font-style:oblique;color:FireBrick}.warning{display:block;font-size:60%;font-weight:bold;color:DarkRed}.no-entry:after{content:'This news feed is empty'}.atom1.author:after{content:'Atom 1.0 Warning: Element </author> is missing'}.atom1.id:after{content:'Atom 1.0 Warning: Element </id> is missing'}.atom1.link:after{content:'Atom 1.0 Warning: Element </link> is missing'}.atom1.published:after{content:'Atom 1.0 Warning: Element </published> is missing'}.atom1.title:after{content:'Atom 1.0 Warning: Element </title> is missing'}.rss2.description:after{content:'RSS 2.0 Warning: Element </description> is missing'}.rss2.link:after{content:'RSS 2.0 Warning: Element </link> is missing'}.rss2.title:after{content:'RSS 2.0 Warning: Element </title> is missing'}abbr,acronym{border-bottom:1px dotted #c30}dt{font-weight:bold}"; stylesheet_rtl = "html,body{text-align:right}#feed{direction:rtl}#logo{float:right;margin-left:9}.geolocation>a{padding-right:6px}.image{float:right;margin-left:40px;margin-right:auto}" style = newDocument.createElement('style'); newDocument.head.append(style); style.type = 'text/css'; // NOTE // Because we use JS, maybe it is better to set direction by // the letters of the initial set of words. var isRTL = newDocument .querySelector( 'meta[name="semitic"]' ); if (isRTL) { style.innerHTML = stylesheet_ltr + stylesheet_rtl; } else { style.innerHTML = stylesheet_ltr; } //var newDoc = document.adoptNode(newDoc.documentElement, true); insertDocument = document .importNode( newDocument .documentElement, true ); removeDocument = document .documentElement; document .replaceChild( insertDocument, removeDocument ); } function queryByXPath(queries) { var result; let i = 0; do { result = document.evaluate( queries[i], document, null, XPathResult.STRING_TYPE); i = i + 1; result = result.stringValue; } while (!result && i < queries.length); return result; }Conclusion: Examine
PromisewithXMLHttpRequest.Note: Encoding has to be explicitly mentioned if it isn't UTF-8.
Decoding non-utf8 server responses using the Fetch API
https://schneide.blog/2018/08/08/decoding-non-utf8-server-responses-using-the-fetch-api/
document.inputEncodingcan achieve it.let request = fetch(url) .then(response => response.arrayBuffer()) .then(buffer => { let decoder = new TextDecoder(document.inputEncoding); let text = decoder.decode(buffer); handleText(text); });and
document.characterSet