www.w3schools.com/tags/ , developer.mozilla.org/input , table-create , html-try , html-input , html-test , text2table , text2table2 , table attributes , school list
colspan=3 rowspan=3; ordered list type: unordered list type:
<style>
tr:nth-child(even) {
background-color: rgba(234, 234, 234, 0.4);
}
</style>