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Optgroup element
The <optgroup> element is used to group together related <option> elements within a parent <select> drop-down list.Try this code-- <html> <body> <h1>The optgroup element</h1> <Comment>The optgroup tag is used to group related options in a drop-down list:</comment> <label for="cars">Choose a car:</label> <select name="cars" id="cars"> <optgroup label="Swedish Cars"> <option value="volvo">Volvo</option> <option value="saab">Saab</option> </optgroup> <optgroup label="German Cars"> <option value="mercedes">Mercedes</option> <option value="audi">Audi</option> </optgroup> </select> <br><br> <input type="submit" value="Submit"> </form> ...
Frameset in HTML
We can merge two website by Frameset. The HTML <frameset> tag is used to divide the window into frames . This tag is not supported in HTML5. Creating Frames To use frames on a page we use <frameset> tag instead of <body> tag. The <frameset> tag defines, how to divide the window into frames. The rows attribute of <frameset> tag defines horizontal frames and cols attribute defines vertical frames. Each frame is indicated by <frame> tag and it defines which HTML document shall open into the frame. Code for Frameset- <!DOCTYPE html> <html> <head> <title>HTML Frames</title> </head> <frameset rows = "10%,80%,10%"> <frame name = "top" src = "/html/top_frame.htm" /> <frame name = "main" src = "/html/main_frame.htm" /> <frame name = "bottom" src = "/html/bottom_frame.htm" /...