using the document.execCommand command to insert a piece of html, is not very effective in the browser.
execute document.execCommand ("innerHTML", false,"
Test
"); 
using the document.execCommand command to insert a piece of html, is not very effective in the browser.
execute document.execCommand ("innerHTML", false,"
Test
");
this method is compatible. Incompatibility under the IE kernel (IE10 and below)
A newly discovered element inserted by
execCommand inherits the style of parent elements such as body.
span the background color inherits from body's backgroundcolor
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