Reference css in html

htmlThe methods for referencing css include inline styles, internal style sheets and external style sheets. Detailed introduction: 1. Inline styles are written directly inside HTML elements and defined through the style attribute. This method is suitable for style definition of a single element. It is not recommended for widespread use in large projects because it will make the HTML code confusing. , difficult to maintain; 2. The internal style sheet is placed in the "" tag of the HTML document and defined using the "