Structured Data Linter

Rel-0.2 Design: CSS-grid with lightbox

for testing purposes, iFrame Web VOWL

Mercury
Mercury (0.4 AU from the Sun) is the closest planet to the Sun and the smallest planet.
Venus
Venus (0.7 AU) is close in size to Earth, (0.815 Earth masses) and like Earth, has a thick silicate mantle around an iron core.
Earth
Earth (1 AU) is the largest and densest of the inner planets, the only one known to have current geological activity.
Mars
Mars details.
Jupiter
Jupiter details.
Saturn
Saturn details.
Neptune
Neptune details.
Uranus
Uranus details.
Mercury
Mercury (0.4 AU from the Sun) is the closest planet to the Sun and the smallest planet.
Venus
Venus (0.7 AU) is close in size to Earth, (0.815 Earth masses) and like Earth, has a thick silicate mantle around an iron core.
Earth
Earth (1 AU) is the largest and densest of the inner planets, the only one known to have current geological activity.