Transformers extracts HTML chunks from arbitrary input files, i.e. when the file is not a pure HTML file. Commonly this would be a javascript file with templating.

List of official transformers

• html-validate-angular: transforms AngularJS components and routes with inline templates.
• html-validate-vue: transforms Vue.js sources. Extracts <template> from single file components and ``template: `...``` strings from javascript files.

List of third-party transformers

• html-validate-markdown: transforms code-fence blocks from markdown files.