jQuery Mobile Docs - Header Bars: "Making buttons visually stand out
Buttons automatically adopt the swatch color of the bar they sit in, so a link in a header bar with the "a" color will also be styled as "a" colored buttons. It's simple to make a button visually stand out — here, we add the data-theme attribute and set the color swatch for the button to "b" to make the "Save" button pop.
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