It is important to note, CONTAC48 elements are created in the space between two surfaces prescribed by the user. This will be covered below. As the surfaces approach each other, the contact element is slowly "crushed" until it's upper node(s) lie along the same line as the lower node(s). Thus, ANSYS can calculate when the two prescribed surfaces have made contact. Other contact elements, such as CONTA175, require a target element, such as TARGE169, to function. When using contact elements in your own analyses, be sure to understand how the elements work. The ANSYS help file has plenty of useful information regarding contact elements and is worth reading.
Pseudo-elements let us target virtual elements that are not specified in the HTML. With the and pseudo-elements we can insert virtual elements before or after an element’s content that are visible to the user and are styleable in the CSS –– so we can actually add to our HTML from our CSS. This is called generated content.
The pseudo-class allows us to style elements based on the URI –– it selects the element that shares the same ID as the URI once it’s targeted by the browser. A link with a fragment identifier will link to an element within the document, known as the target element.
