Topic 1: The HTML tag <img> is used to embed an image into a web page.

Technically, images are not inserted into a web page; images are linked to the webpages. The tag creates a holding space that is used for the referenced image. If the <img> is empty, it only contains the attributes and does not use a closing tag. The two attributes for the img tag are: src – specifies the path to the image and alt which specifies an alternate text for the image.

Topic 2: When using CSS, a color can be specified by using a predefined color name.

These predefined color names can be such colors as tomato, orange, dodgerblue, mediumseagreen, and gray. CSS/HTML support around 140 standard color names. You can set the background color for HTML elements. You can also set the color of the text contained in HTML. Another item that can be colorized is the color of the borders. Using CSS, colors can also be specified using FGB values, HEX values, HSL values, RGBA values, and HSLA values.

Topic 3: Using CSS, background properties are used to add background effects for the elements.

The “background-color” property defines the background color of the element. When using CSS, a color is most specified by using either a valid color name, a HEX value, or a RGB value. You can look at CSS color values for a complete list of possible color values. You can also set the background color for any HTML elements. If you want to adjust the opacity, the opacity property specifies the opacity/transparency of an element. The lower the value, the more transparent.