Highlight each SVG on page without title

getNonTitledSVGs.js

function getSVGs() {
    return $$('svg use').reduce((links, svg) => {
        const image = svg.href.baseVal
        const includes = links.some(obj => Object.values(obj).image)
        if (!includes) {
            links.push({
                element: svg,
                image: image
            })
        }
        return links
    }, []).sort()
}
function getFile(blob) {
    return new Promise(resolve => {
        let reader = new FileReader()
        reader.addEventListener("loadend", () => resolve(reader.result))
        reader.readAsText(blob)
    });
}
function getSVGcontain(url) {
    return fetch(url)
    .then(res => res.blob())
    .then(res => getFile(res))
}
function convertString2html(string) {
    const parser = new DOMParser()
    return parser.parseFromString(string, "text/xml")
}
function getHash(link) {
    const url = new URL(link)
    return url.hash
}
function getTitle(xml, hash) {
    const title = xml.getElementById(hash.slice(1)).querySelector('title')
    return title && title.textContent
}

function highlightElements(link, element, string) {
    const hash = getHash(link)
    const xml = convertString2html(string)
    const title = getTitle(xml, hash)
    if(title === null) {
        element.style.border = '5px solid blue'
    }
}
function checkTitles() {
    getSVGs().map(url => {
        getSVGcontain(url.image)
        .then(res => {
            highlightElements(url.image, url.element.parentNode, res)
        })
    })
}
checkTitles()