ESL Under The Stairs Game Overlay Primer Tutorial

ESL Under The Stairs Game Overlay Primer Tutorial

The HTML map element can be used in a variety of ways, two of which we hone in on with today’s ESL Vocabulary game “Under the Stairs”, a revisit of our previous English Learning – Vocabulary – Under The Stairs is shown below, where that same HTML map element used then, today, starts as …

1. a jigsaw “overlay” to the underlying image (in that we try to cover the whole area of the image with clickable HTML area “polygon” segments (the so called “Click and be Prompted” mode of use)) … but if the user selects a “Find Prompted Object” mode of use that same HTML map element is reworked to become like …
2. a “Where’s Wally” scenario where the computer prompts the user for what they should click on, where the HTML map element has one defined HTML area tag plus one other default “nonhref” HTML area tag

Again, we are in the area of study of “overlay”, the HTML map tag being a well established overlay method linking image data with co-ordinate intelligence, still a useful idea we think.

HTML and Javascript codewise the original under_the_stairs.html is unchanged from the way it was below, but today, with our changed scenario, it is used within an HTML iframe element using our Client Pre-emptive Iframe techniques to glean HTML map information, and then reworked as necessary directly into that iframe, and the HTML and Javascript for this is pre_under_the_stairs.html channeling those oft-mentioned CSS techniques …

1. position:absolute property
2. z-index
3. opacity

The “overlay” concept comes into play, too, for the user to control the mode of use of the web application (ie. its HTML map element’s mode of use) via an HTML select tag “overlayed” on top of an HTML iframe element which exists that way for 20 seconds allowing the user to choose that other mode of use should they be interested.

This could all become much clearer when you try a live run and we hope it leaves you with some ideas to try out yourself in a project you are working on.

Previous relevant English Learning – Vocabulary – Under The Stairs is shown below.

English Learning - Vocabulary - Under The Stairs

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