diff --git a/src/converts/dom-to-foreign-object-svg.ts b/src/converts/dom-to-foreign-object-svg.ts
index 35b263e..ef335c2 100644
--- a/src/converts/dom-to-foreign-object-svg.ts
+++ b/src/converts/dom-to-foreign-object-svg.ts
@@ -83,7 +83,6 @@ function createForeignObjectSvg(clone: Node, context: Context): SVGSVGElement {
   foreignObject.setAttributeNS(null, 'y', '0%')
   foreignObject.setAttributeNS(null, 'width', '100%')
   foreignObject.setAttributeNS(null, 'height', '100%')
-  foreignObject.setAttributeNS(null, 'externalResourcesRequired', 'true')
   foreignObject.append(clone)
   svg.appendChild(foreignObject)
   return svg
diff --git a/src/css-url.ts b/src/css-url.ts
index f59b0a7..c273851 100644
--- a/src/css-url.ts
+++ b/src/css-url.ts
@@ -10,21 +10,19 @@ export async function replaceCssUrlToDataUrl(
 ): Promise<string> {
   if (!hasCssUrl(cssText)) return cssText
 
-  for (const url of parseCssUrls(cssText)) {
+  for (const [rawUrl, url] of parseCssUrls(cssText, baseUrl)) {
     try {
       const dataUrl = await contextFetch(
         context,
         {
-          url: baseUrl
-            ? resolveUrl(url, baseUrl)
-            : url,
+          url,
           requestType: isImage ? 'image' : 'text',
           responseType: 'dataUrl',
         },
       )
-      cssText = cssText.replace(toRE(url), `$1${ dataUrl }$3`)
+      cssText = cssText.replace(toRE(rawUrl), `$1${ dataUrl }$3`)
     } catch (error) {
-      consoleWarn('Failed to fetch css data url', url, error)
+      consoleWarn('Failed to fetch css data url', rawUrl, error)
     }
   }
 
@@ -35,15 +33,17 @@ export function hasCssUrl(cssText: string): boolean {
   return /url\((['"]?)([^'"]+?)\1\)/.test(cssText)
 }
 
-function parseCssUrls(cssText: string): string[] {
-  const result: string[] = []
+export const URL_RE = /url\((['"]?)([^'"]+?)\1\)/g
 
-  cssText.replace(/url\((['"]?)([^'"]+?)\1\)/g, (raw, quotation, url) => {
-    result.push(url)
+function parseCssUrls(cssText: string, baseUrl: string | null): [string, string][] {
+  const result: [string, string][] = []
+
+  cssText.replace(URL_RE, (raw, quotation, url) => {
+    result.push([url, resolveUrl(url, baseUrl)])
     return raw
   })
 
-  return result.filter((url) => !isDataUrl(url))
+  return result.filter(([url]) => !isDataUrl(url))
 }
 
 function toRE(url: string): RegExp {
diff --git a/src/embed-web-font.ts b/src/embed-web-font.ts
index 9f4d420..f6d92c3 100644
--- a/src/embed-web-font.ts
+++ b/src/embed-web-font.ts
@@ -1,6 +1,6 @@
-import { hasCssUrl, replaceCssUrlToDataUrl } from './css-url'
+import { URL_RE, hasCssUrl, replaceCssUrlToDataUrl } from './css-url'
 import { contextFetch } from './fetch'
-import { consoleWarn, isCssFontFaceRule } from './utils'
+import { consoleWarn, isCssFontFaceRule, resolveUrl } from './utils'
 import type { Context } from './context'
 
 export async function embedWebFont<T extends Element>(
@@ -24,7 +24,7 @@ export async function embedWebFont<T extends Element>(
 
   if (font && font.cssText) {
     const cssText = filterPreferredFormat(font.cssText, context)
-    svgStyleElement.appendChild(ownerDocument.createTextNode(`\n${ cssText }\n`))
+    svgStyleElement.appendChild(ownerDocument.createTextNode(`${ cssText }\n`))
   } else {
     try {
       const cssRules = await getCssRules(Array.from(ownerDocument.styleSheets), context)
@@ -77,15 +77,17 @@ async function getCssRules(
             .filter(rule => rule.constructor.name === 'CSSImportRule')
             .map(async rule => {
               let importIndex = index + 1
-              const url = (rule as CSSImportRule).href
+              const baseUrl = (rule as CSSImportRule).href
               try {
                 const cssText = await contextFetch(context, {
-                  url,
+                  url: baseUrl,
                   requestType: 'text',
                   responseType: 'text',
                 })
-                const embedCssText = await embedFonts(cssText, url, context)
-                for (const rule of parseCss(embedCssText)) {
+                const replacedCssText = cssText.replace(URL_RE, (raw, quotation, url) => {
+                  return raw.replace(url, resolveUrl(url, baseUrl))
+                })
+                for (const rule of parseCss(replacedCssText)) {
                   try {
                     sheet.insertRule(
                       rule,
@@ -119,29 +121,6 @@ async function getCssRules(
   return ret
 }
 
-const URL_MATCH_RE = /url\([^)]+\)/g
-const URL_REPLACE_RE = /url\(["']?([^"')]+)["']?\)/g
-
-async function embedFonts(cssText: string, baseUrl: string, context: Context): Promise<string> {
-  await Promise.all(
-    cssText.match(URL_MATCH_RE)?.map(async location => {
-      let url = location.replace(URL_REPLACE_RE, '$1')
-      if (!url.startsWith('https://')) {
-        url = new URL(url, baseUrl).href
-      }
-      return contextFetch(context, {
-        url,
-        requestType: 'text',
-        responseType: 'dataUrl',
-      }).then(base64 => {
-        // Side Effect
-        cssText = cssText.replace(location, `url(${ base64 })`)
-      })
-    }) ?? [],
-  )
-  return cssText
-}
-
 const COMMENTS_RE = /(\/\*[\s\S]*?\*\/)/gi
 const KEYFRAMES_RE = /((@.*?keyframes [\s\S]*?){([\s\S]*?}\s*?)})/gi
 
diff --git a/src/utils.ts b/src/utils.ts
index 8cf9837..93679d3 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -97,7 +97,7 @@ export function svgToDataUrl(svg: SVGElement) {
   const xhtml = new XMLSerializer()
     .serializeToString(svg)
     // eslint-disable-next-line no-control-regex
-    .replace(/[\u0000-\u001F\u007F-\u009F]/g, '')
+    .replace(/[\u0000-\u0008\u000B-\u000C\u000E-\u001F\uD800-\uDFFF\uFFFE-\uFFFF]/g, '')
   return `data:image/svg+xml;charset=utf-8,${ encodeURIComponent(xhtml) }`
 }
 
diff --git a/test/fixtures/xml.ascii-null-character.html b/test/fixtures/xml.ascii-null-character.html
new file mode 100644
index 0000000..3f0bf30
Binary files /dev/null and b/test/fixtures/xml.ascii-null-character.html differ
diff --git a/test/fixtures/xml.ascii-null-character.png b/test/fixtures/xml.ascii-null-character.png
new file mode 100644
index 0000000..62eda0d
Binary files /dev/null and b/test/fixtures/xml.ascii-null-character.png differ