You learned that you can use the tags to insert a link to another webpage. One problem that webpage developers face is that, after a time, links may no longer work. Can you think of ways that you can avoid broken links?

The type of program is the hierarchical grid

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Well, this code would box the whole body of an html document. by using the relative value for position, you are telling it to position relative to its normal position, which the top left corner is at (0,0). by using left: 50px, you are telling the box to set the left margin  edge to 50px and by using top: 50px, you are telling it to set the top margin edge to 50px. by doing this shifting, the top left corner of the box, which is at (0,0) would be positioned at (50,50)