Adding upstream version 5.2.3+dfsg.

Signed-off-by: Daniel Baumann <daniel@debian.org>

build/vnu-jar.js

@@ -0,0 +1,57 @@
+#!/usr/bin/env node
+
+/*!
+ * Script to run vnu-jar if Java is available.
+ * Copyright 2017-2022 The Bootstrap Authors
+ * Copyright 2017-2022 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
+ */
+
+'use strict'
+
+const { execFile, spawn } = require('node:child_process')
+const vnu = require('vnu-jar')
+
+execFile('java', ['-version'], (error, stdout, stderr) => {
+  if (error) {
+    console.error('Skipping vnu-jar test; Java is missing.')
+    return
+  }
+
+  const is32bitJava = !/64-Bit/.test(stderr)
+
+  // vnu-jar accepts multiple ignores joined with a `|`.
+  // Also note that the ignores are string regular expressions.
+  const ignores = [
+    // "autocomplete" is included in <button> and checkboxes and radio <input>s due to
+    // Firefox's non-standard autocomplete behavior - see https://bugzilla.mozilla.org/show_bug.cgi?id=654072
+    'Attribute “autocomplete” is only allowed when the input type is.*',
+    'Attribute “autocomplete” not allowed on element “button” at this point.',
+    // Per https://www.w3.org/TR/html-aria/#docconformance having "aria-disabled" on a link is
+    // NOT RECOMMENDED, but it's still valid - we explain in the docs that it's not ideal,
+    // and offer more robust alternatives, but also need to show a less-than-ideal example
+    'An “aria-disabled” attribute whose value is “true” should not be specified on an “a” element that has an “href” attribute.'
+  ].join('|')
+
+  const args = [
+    '-jar',
+    `"${vnu}"`,
+    '--asciiquotes',
+    '--skip-non-html',
+    '--Werror',
+    `--filterpattern "${ignores}"`,
+    '_site/',
+    'js/tests/'
+  ]
+
+  // For the 32-bit Java we need to pass `-Xss512k`
+  if (is32bitJava) {
+    args.splice(0, 0, '-Xss512k')
+  }
+
+  return spawn('java', args, {
+    shell: true,
+    stdio: 'inherit'
+  })
+    .on('exit', process.exit)
+})