func (s *CIService) DocPreviewHTML(ctx context.Context, name string, opt *DocPreviewHTMLOptions) (*Response, error)

opt := &cos.DocPreviewHTMLOptions{
    DstType:  "html",
    SrcType:  "ppt",
    Copyable: "1",
    HtmlParams: &cos.HtmlParams{
        CommonOptions: &cos.HtmlCommonParams{
            IsShowTopArea: false,
        },
        PptOptions: &cos.HtmlPptParams{
            IsShowBottomStatusBar: true,
        },
    },
    Htmlwaterword:  "5pWw5o2u5LiH6LGhLeaWh+aho+mihOiniA==",
    Htmlfillstyle:  "cmdiYSgxMDIsMjA0LDI1NSwwLjMp", // rgba(102,204,255,0.3)
    Htmlfront:      "Ym9sZCAyNXB4IFNlcmlm",         // bold 25px Serif
    Htmlrotate:     "315",
    Htmlhorizontal: "50",
    Htmlvertical:   "100",
}
resp, err := c.CI.DocPreviewHTML(context.Background(), "form.pdf", opt)

type DocPreviewHTMLOptions struct {
    DstType        string      `url:"dstType,omitempty"`
    SrcType        string      `url:"srcType,omitempty"`
    Sign           string      `url:"sign,omitempty"`
    Copyable       string      `url:"copyable,omitempty"`
    HtmlParams     *HtmlParams `url:"htmlParams,omitempty"`
    Htmlwaterword  string      `url:"htmlwaterword,omitempty"`
    Htmlfillstyle  string      `url:"htmlfillstyle,omitempty"`
    Htmlfront      string      `url:"htmlfront,omitempty"`
    Htmlrotate     string      `url:"htmlrotate,omitempty"`
    Htmlhorizontal string      `url:"htmlhorizontal,omitempty"`
    Htmlvertical   string      `url:"htmlvertical,omitempty"`
}

type HtmlParams struct {
    CommonOptions *HtmlCommonParams `json:"commonOptions,omitempty"`
    WordOptions   *HtmlWordParams   `json:"wordOptions,omitempty"`
    PdfOptions    *HtmlPdfParams    `json:"pdfOptions,omitempty"`
    PptOptions    *HtmlPptParams    `json:"pptOptions,omitempty"`
}

type HtmlCommonParams struct {
    IsShowTopArea           bool `json:"isShowTopArea"`
    IsShowHeader            bool `json:"isShowHeader"`
    IsBrowserViewFullscreen bool `json:"isBrowserViewFullscreen"`
    IsIframeViewFullscreen  bool `json:"isIframeViewFullscreen"`
}

type HtmlWordParams struct {
    IsShowDocMap          bool `json:"isShowDocMap"`
    IsBestScale           bool `json:"isBestScale"`
    IsShowBottomStatusBar bool `json:"isShowBottomStatusBar"`
}

type HtmlPdfParams struct {
    IsShowComment         bool `json:"isShowComment"`
    IsInSafeMode          bool `json:"isInSafeMode"`
    IsShowBottomStatusBar bool `json:"isShowBottomStatusBar"`
}

type HtmlPptParams struct {
    IsShowBottomStatusBar bool `json:"isShowBottomStatusBar"`
}