Both together. An earlier version of the framework we develop at our team uses handlebars as its default templating engine. I could do
`<div class="${options.classprefix}popup">` +
`<h1 class="${options.classprefix}popup-links">${options.modalTitle}</h1>` +
`<div class="${options.classprefix}pop-links">` +
`${allTheLinksHTMLString}` +
`</div>` +
`</div>`
Both together helped me write markup very similar looking to jsx syntax :D