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Use the CSS :optional selector to style elements with no "required" attribute.ExampleYou can try to run the following code to implement the :optional selector:Live demo                    input:optional {             background-color: blue;          }                              Subject:          Student:          

Use the CSS :optional selector to style elements with no "required" attributeExampleYou can try to run the following code to implement the :optional selector:Live Demo                    input:optional {             background-color: blue;          }                              Subject:          Student:          

Use the CSS :only-child selector to style every element that is the only child of its parent.ExampleYou can try to run the following code to implement the :only-child selectorLive Demo                    p:only-child {             background: orange;          }                     Heading                This is a paragraph.                      This is a paragraph.          This is a paragraph.          This is a paragraph.          

Use the CSS :only-of-type selector to style every element that is the only element of its parent.ExampleYou can try to run the following code to implement the :only-of-type selector:Live Demo                    p:only-of-type {             background: orange;             color: white;          }                              This is demo text 1.                      This is demo text 2.          This is demo text 3.          This is demo text 4.          

Use the CSS :only-of-type selector to style every element that is the only element of its parent.ExampleYou can try to run the following code to implement the :only-of-type selectorLive Demo                    p:only-of-type {             background: orange;             color: white;          }                              This is demo text 1.                      This is demo text 2.          This is demo text 3.          This is demo text 4.          

Use the CSS :nth-of-type(n) selector to style every element that is the nth element of its parent. You can try to run the following code to implement the :nth-of-type(n) selectorExampleLive Demo                    p:nth-of-type(2) {             background: yellow;          }                     This is demo text 1.       This is demo text 2.       This is demo text 3.       This is demo text 4.    

The following are the methods used to call 3D transforms:ValuesDescriptionmatrix3d(n, n, n, n, n, n, n, n, n, n, n, n, n, n, n, n)Used to transforms the element by using 16 values of the matrixtranslate3d(x, y, z)Used to transforms the element by using x-axis, y-axis, and z-axistranslateX(x)Used to transforms the element by using x-axistranslateY(y)Used to transforms the element by using y-axistranslateZ(z)Used to transforms the element by using y-axisscaleX(x)Used to scale transforms the element by using x-axisscaleY(y)Used to scale transforms the element by using y-axisscaleY(y)Used to transforms the element by using z-axisrotateX(angle)Used to rotate transforms the element by using x-axisrotateY(angle)Used ... Read More

Use the CSS :nth-of-type(n) selector to style every element that is the nth element of its parent. You can try to run the following code to implement the :nth-of-type(n) selectorExampleLive Demo                    p:nth-of-type(2) {             background: yellow;          }                     This is demo text 1.       This is demo text 2.       This is demo text 3.       This is demo text 4.    

Use the CSS :nth-last-of-type(n) selector to select every element that is the second element of its parent, counting from the last child.ExampleYou can try to run the following code to implement the :nth-last-of-type(n) selector:Live Demo                    p:nth-last-of-type(2) {             background: blue;             color: white;          }                     This is demo text 1.       This is demo text 2.       This is demo text 3.       This is demo text 4.       This is demo text 5.    

To style every element that is the second child of its parent with CSS, use the CSS :nth-child(n) selector.ExampleYou can try to run the following code to implement the :nth-child(n) selectorLive Demo                    p:nth-child(4) {             background: orange;             color: white;          }                     This is demo text 1.       This is demo text 2.       This is demo text 3.       This is demo text 4.       This is demo text 5.       This is demo text 6.