Index - H
| h1 | Clay.Elements, Clay |
| h2 | Clay.Elements, Clay |
| h3 | Clay.Elements, Clay |
| h4 | Clay.Elements, Clay |
| h5 | Clay.Elements, Clay |
| h6 | Clay.Elements, Clay |
| handheld | Clay.Media |
| hanging | Clay.Text, Clay |
| head | Clay.Elements, Clay |
| header | Clay.Elements, Clay |
| headers | Clay.Attributes, Clay |
| height | |
| 1 (Function) | Clay.Geometry, Clay |
| 2 (Function) | Clay.Media |
| 3 (Function) | Clay.Attributes |
| hGradient | Clay.Gradient, Clay |
| hgroup | Clay.Elements, Clay |
| Hidden | Clay.Common, Clay |
| hidden | |
| 1 (Function) | Clay.Common, Clay |
| 2 (Function) | Clay.Attributes |
| high | Clay.Attributes, Clay |
| hiragana | Clay.List, Clay |
| honeydew | Clay.Color, Clay |
| hotpink | Clay.Color, Clay |
| hover | Clay.Pseudo, Clay |
| hr | Clay.Elements, Clay |
| href | Clay.Attributes, Clay |
| hreflang | Clay.Attributes, Clay |
| hRepeatingGradient | Clay.Gradient, Clay |
| hsl | Clay.Color, Clay |
| Hsla | Clay.Color, Clay |
| hsla | Clay.Color, Clay |
| html | Clay.Elements, Clay |
| httpEquiv | Clay.Attributes, Clay |
| hueRotate | Clay.Filter, Clay |