Wipe, in a computing context, means  to render all data on a hard drive unreadable. The term is often used in reference to making data stored on a computer, smartphone or tablet inaccessible before disposing of the device.
A semantic HTML tag is one that defines a meaning to the enclosed content that a computer can be programmed to understand. In most cases, browsers create some visual difference to content in semantic tags, for example, content in the CODE element is usually displayed in a monospaced font. But this is not a requirement. Many people feel that semantic HTML elements are a waste of bandwidth.
HTML stands for HyperText Markup Language. Developed by scientist Tim Berners-Lee in 1990, HTML is the hidden code that helps us communicate with others on the World Wide Web (WWW). When writing HTML, you add tags to the text in order to create the structure. These tags tell the browser how to display the text or graphics in the document. For example, the following document has a simple layout (structure). Notice there are three major parts: a heading, two paragraphs and a bulleted list.