Option to skip attribute normalization

README.md

@@ -112,6 +112,7 @@ Most of the options are disabled by default.
 | `sortClassName`                | [Sort style classes by frequency](#sorting-attributes--style-classes) | `false` |
 | `trimCustomFragments`          | Trim white space around `ignoreCustomFragments`. | `false` |
 | `useShortDoctype`              | [Replaces the `doctype` with the short (HTML5) doctype](http://perfectionkills.com/experimenting-with-html-minifier#use_short_doctype) | `false` |
+| `normalizeAttributes`          | Normalize attributes | `true` |
 
 ### Sorting attributes / style classes
 

src/htmlminifier.js

@@ -542,6 +542,14 @@ function canTrimWhitespace(tag) {
 }
 
 async function normalizeAttr(attr, attrs, tag, options) {
+  if (!options.normalizeAttributes) {
+    return {
+      attr,
+      name: attr.name,
+      value: attr.value
+    };
+  }
+
   const attrName = options.name(attr.name);
   let attrValue = attr.value;
 
@@ -654,7 +662,8 @@ const processOptions = (inputOptions) => {
     log: identity,
     minifyCSS: identityAsync,
     minifyJS: identity,
-    minifyURLs: identity
+    minifyURLs: identity,
+    normalizeAttributes: true,
   };
 
   Object.keys(inputOptions).forEach(function (key) {

tests/minifier.spec.js

@@ -175,6 +175,12 @@ test('space normalization between attributes', async () => {
   expect(await minify('<input title="bar"       id="boo"    value="hello world">')).toBe('<input title="bar" id="boo" value="hello world">');
 });
 
+test('not normalize attributes', async () => {
+  expect(await minify('<p title="bar">foo</p>', { normalizeAttributes: false })).toBe('<p title="bar">foo</p>');
+  expect(await minify('<img src="test"/>', { normalizeAttributes: false })).toBe('<img src="test">');
+  expect(await minify('<img src=" test "/>', { normalizeAttributes: false })).toBe('<img src=" test ">');
+});
+
 test('space normalization around text', async () => {
   let input, output;
   input = '   <p>blah</p>\n\n\n   ';