Roboto with Roboto Slab in action on blog.google

Under the hood

.header-1 { font-family: "Roboto Slab", "Lucida Bright", Verdana, Georgia, serif; font-size: 70px; font-style: normal; font-weight: 300; letter-spacing: 0px; line-height: 70px; text-transform: none; color: #000000; }
.content-1 { font-family: Roboto, sans-serif; font-size: 12px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 12px; text-transform: uppercase; color: #000000; }
.content-2 { font-family: Roboto, sans-serif; font-size: 12px; font-style: normal; font-weight: normal; letter-spacing: 0px; line-height: 17px; text-transform: uppercase; color: #000000; }
.content-3 { font-family: "Roboto Slab", "Lucida Bright", Verdana, Georgia, serif; font-size: 17px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 17px; text-transform: none; color: #000000; }
.content-4 { font-family: "Roboto Slab", "Lucida Bright", Verdana, Georgia, serif; font-size: 17px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 30px; text-transform: none; color: #333333; }