fix bug 1198896 - Allow <a> tags in spec. desc.
fix bug 1198896 - Allow <a> tags in spec. desc.

mdn/browsercompat,jwhitlock/web-platform-compat,mdn/browsercompat,renoirb/browsercompat,mdn/browsercompat,jwhitlock/web-platform-compat,renoirb/browsercompat,jwhitlock/web-platform-compat,renoirb/browsercompat