A table cell like that will affect word wrapping, but datoms this may work.

cut-n-paste this into a document to see.

These primitives are used to decorate <em|a posteriori> the
<datoms|<macro|x|<tabular|<tformat|<cwith|0|0|0|0|cell-background|pastel
yellow>|<table|<row|<cell|<arg|x>>>>>>>|lines of a paragraph , the lines of a
page, or the pages of a document.> Currently, only decorations of atoms on
lines of a paragraph have been implemented.

On Thu, Jul 3, 2014 at 8:31 AM, Miguel de Benito Delgado
<address@hidden> wrote:
> You can achieve this with a table of one cell, without borders, padding,
> etc. See std-markup.ts in the sources for an example in the macro "todo"
> (e.g. search for the word todo in the style files by pressing Shift+F1)
>
> --
> Miguel de  Benito.
>
>
> On Tue, Jul 1, 2014 at 1:38 PM, Zhao_yunsong <address@hidden> wrote:
>>
>> " <address@hidden>
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>> How can I change background of just a few words? Thanks!
>>
>>
>