There is no formal category that can be called slide chords, yet this overview highlights aspects when using a slide from a chordal perspective. A slide is positioned directly above the fret and not just before as fingers when playing a chord. The diagrams are therefore using a half transparent line representing the slide. Of natural reasons the most straightforward way of accomplished chord with a slide is by include tones on the same fret vertically. Additional methods are possible, such as muting a strings in front of the slide (if the slide is not put on the little finger).
Some brief advice if you are unexperienced with slide guitar: 1) Don’t press down the strings with the slide; 2) the slide should be positioned just over the fret; 3) for a vibrato, wiggle the slide back and forth.
Open D tuning
Since the positions are movable, only a few chords (the important IV and V) are included.
Learn more about Open D tuning.
Open G tuning
As in Open D tuning, minor chords are seldom a viable choice with unnatural methods, but playing the two highest strings will result in minor chords with omitted fifths.
Learn more about Open G tuning.