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Hypertext Markup Language (HTML) has an element known as an iframe that allows a person to insert a completely different website within a page. HTML comes outfitted with three major types of iframe scrollbars, and a user can also use Cascading Style Sheets (CSS) to make the iframe scrollbars different. The scrollbars are used to help users navigate the iframe but, at the same time, some iframes either won’t need the scrollbars or look better without them.
The default setting for iframe scrollbars is "auto", so even if a scrollbar type is not specified, this will be set as the scrollbar option. If scrollbars are not needed by the iframe, then they will not appear with this setting. If scrollbars are needed, because the contents are larger than the iframe, then the bars will appear. The auto setting takes the iframe’s contents into account and works accordingly.
The next type of scrollbar setting for the iframe is "yes". With this setting, iframe scrollbars will appear, regardless of the iframe contents. Even if there is just a small image in the iframe and there is nothing to be scrolled, the scrollbars will appear anyway.
"No" is the third option for iframe scrollbars. Much like the yes option, this setting ignores the contents of the iframe. The only difference is that this setting places no scrollbars in the iframe, even if the contents are large and need to be scrolled. Some Internet browsers find scrollbars irritating, regardless of need, and this setting is tailor-made with such browsers in mind.
Along with these three settings, a person can also customize the CSS settings for the iframe scrollbars. CSS is used to control the visual aspect of a website, such as the placement of images and colors of text and certain elements. It can also be used to change the colors of scrollbars, both for the iframe and the entire website.
To properly set the scrollbar colors, there are eight sections of code a user needs to add: base-color, arrow-color, track-color, shadow-color, lightshadow-color, darkshadow-color, highlight-color and 3dlight-color. The most accurate way to set the color is to add the hexadecimal value of any color, but some color names — such as black or purple — also can be used. When setting the scrollbar color for the iframe, one should ensure the CSS is set to alter the iframe; otherwise this will change the scrollbar for the whole website.