I came across this element few weeks ago. Before this,I used to use a div with stuff, and javascript to show hide that div when required. E.g. Spanner icon in

I came across this element few weeks ago. Before this,I used to use a div with stuff, and javascript to show hide that div when required. E.g. Spanner icon in this page, lower left corner: https://spa.bydav.in/tsDMV/tsVerif.html https://spa.bydav.in/tsDMV/tsVerif.html Now, recently I used this dialog element with javascript & buttons to show hide div. E.g like Settings button at https://spa.bydav.in/weather/ https://spa.bydav.in/weather/ I like that it comes on top, stays in center, no checkbook & css stuff.